900877 ÷ 20 
We're looking to find how many times 20 goes into 900877.

Going ahead to step 1:
9 divided by 20 is 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 20

Moving on to step 2:
When dividing 90 by 20, we get 4 with a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 80 from 90 to get 10.
Grab the next digit (0) from the dividend, add it to 10, then carry on: 100 / 20

Let's proceed to step 3:
The number 20 fits into 100 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 45.0
The remainder is 0 after subtracting 100 from 100.
Grab the next digit (8) from the dividend, add it to 0, then carry on: 8 / 20

Moving on to step 4:
If we divide 8 by 20, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 450.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 20

Going ahead to step 5:
When dividing 87 by 20, we get 4 with a remainder of 7.
Record the quotient 4 as the next digit in the result. 
Result so far: 4504.0
Subtract 80 from 87 to get 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 20

Moving on to step 6:
If we divide 77 by 20, we get 3 and a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 45043.0
The remainder is 17 after subtracting 60 from 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 7:
If we divide 170 by 20, we get 8 and a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 45043.8
Deduct 160 from 170 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
If we divide 100 by 20, we get 5 and a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 45043.85
Subtracting 100 from 100 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.

Step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 45043.85
If we take 0 away from 0, we end up 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.

Let's proceed to step 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 45043.85
The remainder is 0 after subtracting 0 from 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 final outcome is 45043.85, with a leftover of 0.0.