901020 divided by 20 
Let's see how many times 20 fits into 901020.

Moving on to step 1:
20 goes into 9 0 times with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Grab the next digit (0) from the dividend, add it to 9, then carry on: 90 / 20

Let's proceed to step 2:
The number 20 fits into 90 4 times, leaving a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 80 away from 90, we end up with 10.
Bring next digit (1) of the dividend behind the 10 and repeat the process: 101 / 20

Going ahead to step 3:
If we divide 101 by 20, we get 5 and a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 45.0
Deduct 100 from 101 and we're left with 1.
Append the next digit (0) from the dividend to 1 and continue with: 10 / 20

Step 4:
When dividing 10 by 20, we get 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 450.0
Subtract 0 from 10 to get 10.
Include the next digit (2) from the dividend after 10, then repeat: 102 / 20

On to step 5:
20 goes into 102 5 times with a remainder of 2.
The next digit of our result is 5. 
Result so far: 4505.0
The remainder is 2 after subtracting 100 from 102.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 20

Step 6:
20 goes into 20 1 times with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 45051.0
The remainder is 0 after subtracting 20 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 45051.0
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.

Let's proceed to step 8:
0 divided by 20 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 45051.0
If we subtract 0 from 0, 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.

The final outcome is 45051.0, with a leftover of 0.0.