20915990 ÷ 280 
Let's see how many times 280 fits into 20915990.

Moving on to step 1:
The number 280 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 280

Advancing to step 2:
280 can be fit into 20 0 times, resulting in a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 20 leaves us with 20.
Include the next digit (9) from the dividend after 20, then repeat: 209 / 280

Moving on to step 3:
209 divided by 280 is 0 with a remainder of 209.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 209, we get 209.
Include the next digit (1) from the dividend after 209, then repeat: 2091 / 280

Let's proceed to step 4:
280 can be fit into 2091 7 times, resulting in a remainder of 131.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we take 1960 away from 2091, we end up with 131.
Include the next digit (5) from the dividend after 131, then repeat: 1315 / 280

On to step 5:
280 can be fit into 1315 4 times, resulting in a remainder of 195.
Record the quotient 4 as the next digit in the result. 
Result so far: 74.0
Subtracting 1120 from 1315 leaves us with 195.
Append the next digit (9) from the dividend to 195 and continue with: 1959 / 280

Let's proceed to step 6:
280 goes into 1959 6 times with a remainder of 279.
Use 6 as the next digit of our solution. 
Result so far: 746.0
Subtract 1680 from 1959 to get 279.
Grab the next digit (9) from the dividend, add it to 279, then carry on: 2799 / 280

Going ahead to step 7:
If we divide 2799 by 280, we get 9 and a remainder of 279.
The number 9 becomes the next digit in our result. 
Result so far: 7469.0
The remainder is 279 after subtracting 2520 from 2799.
Include the next digit (0) from the dividend after 279, then repeat: 2790 / 280

Let's proceed to step 8:
If we divide 2790 by 280, we get 9 and a remainder of 270.
The next digit of our result is 9. 
Result so far: 74699.0
If we subtract 2520 from 2790, we get 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Going ahead to step 9:
If we divide 2700 by 280, we get 9 and a remainder of 180.
The number 9 becomes the next digit in our result. 
Result so far: 74699.9
If we subtract 2520 from 2700, we get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Let's proceed to step 10:
280 can be fit into 1800 6 times, resulting in a remainder of 120.
Write down 6 as next digit of the result. 
Result so far: 74699.96
Deduct 1680 from 1800 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Going ahead to step 11:
If we divide 1200 by 280, we get 4 and a remainder of 80.
Record the quotient 4 as the next digit in the result. 
Result so far: 74699.964
The remainder is 80 after subtracting 1120 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 12:
The number 280 fits into 800 2 times, leaving a remainder of 240.
Put 2 as the next digit of the answer. 
Result so far: 74699.9642
Subtracting 560 from 800 leaves us with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Moving on to step 13:
2400 divided by 280 is 8 with a remainder of 160.
The number 8 becomes the next digit in our result. 
Result so far: 74699.96428
If we take 2240 away from 2400, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Moving on to step 14:
1600 divided by 280 is 5 with a remainder of 200.
Record the quotient 5 as the next digit in the result. 
Result so far: 74699.964285
The remainder is 200 after subtracting 1400 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Let's proceed to step 15:
The number 280 fits into 2000 7 times, leaving a remainder of 40.
The next digit of our result is 7. 
Result so far: 74699.9642857
Subtract 1960 from 2000 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 16:
280 can be fit into 400 1 times, resulting in a remainder of 120.
Put 1 as the next digit of the answer. 
Result so far: 74699.96428571
Subtract 280 from 400 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

The final result is 74699.96428571 with a remainder of 1.2e-07.