We're dividing 901257 by 20 
Let's see how many times 20 fits into 901257.

Advancing to step 1:
The number 20 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 20

On to step 2:
20 can be fit into 90 4 times, resulting in a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 80 from 90 leaves us with 10.
Fetch the next digit (1) from the dividend, attach it to 10 and continue: 101 / 20

Moving on to step 3:
If we divide 101 by 20, we get 5 and a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
Deduct 100 from 101 and we're left with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 20

On to step 4:
When dividing 12 by 20, we get 0 with a remainder of 12.
The next digit of our result is 0. 
Result so far: 450.0
Subtracting 0 from 12 leaves us with 12.
Fetch the next digit (5) from the dividend, attach it to 12 and continue: 125 / 20

Moving on to step 5:
20 goes into 125 6 times with a remainder of 5.
The next digit of our result is 6. 
Result so far: 4506.0
If we subtract 120 from 125, we get 5.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 20

Moving on to step 6:
If we divide 57 by 20, we get 2 and a remainder of 17.
Record the quotient 2 as the next digit in the result. 
Result so far: 45062.0
Subtract 40 from 57 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 7:
20 can be fit into 170 8 times, resulting in a remainder of 10.
The next digit of our result is 8. 
Result so far: 45062.8
Subtract 160 from 170 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
100 divided by 20 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 45062.85
If we subtract 100 from 100, 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 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: 45062.85
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.

Let's proceed to step 10:
When dividing 0 by 20, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 45062.85
Subtract 0 from 0 to 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.

The quotient of the division is 45062.85, and the remainder is 0.0.