We divide 81985388 by 20
We're looking to find how many times 20 goes into 81985388.

On to step 1:
If we divide 8 by 20, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 20

Step 2:
20 can be fit into 81 4 times, resulting in a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we subtract 80 from 81, we get 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 20

Let's proceed to step 3:
The number 20 fits into 19 0 times, leaving a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 40.0
Subtract 0 from 19 to get 19.
Bring next digit (8) of the dividend behind the 19 and repeat the process: 198 / 20

Advancing to step 4:
The number 20 fits into 198 9 times, leaving a remainder of 18.
Write down 9 as next digit of the result. 
Result so far: 409.0
Subtracting 180 from 198 leaves us with 18.
Bring next digit (5) of the dividend behind the 18 and repeat the process: 185 / 20

Moving on to step 5:
20 can be fit into 185 9 times, resulting in a remainder of 5.
The next digit of our result is 9. 
Result so far: 4099.0
If we subtract 180 from 185, we get 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 20

Moving on to step 6:
20 goes into 53 2 times with a remainder of 13.
Use 2 as the next digit of our solution. 
Result so far: 40992.0
Deduct 40 from 53 and we're left with 13.
Bring next digit (8) of the dividend behind the 13 and repeat the process: 138 / 20

Going ahead to step 7:
20 can be fit into 138 6 times, resulting in a remainder of 18.
Put 6 as the next digit of the answer. 
Result so far: 409926.0
The remainder is 18 after subtracting 120 from 138.
Fetch the next digit (8) from the dividend, attach it to 18 and continue: 188 / 20

Going ahead to step 8:
If we divide 188 by 20, we get 9 and a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 4099269.0
Subtract 180 from 188 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
If we divide 80 by 20, we get 4 and a remainder of 0.
The next digit of our result is 4. 
Result so far: 4099269.4
If we subtract 80 from 80, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
20 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 4099269.4
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 11:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 4099269.4
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 4099269.4, and the remainder is 0.0.