We divide 90120481 by 20
We want to divide 90120481 by 20.

Advancing to step 1:
20 can be fit into 9 0 times, resulting in a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 20

Going ahead to step 2:
The number 20 fits into 90 4 times, leaving a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 80 from 90 to get 10.
Include the next digit (1) from the dividend after 10, then repeat: 101 / 20

Moving on to step 3:
The number 20 fits into 101 5 times, leaving a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 45.0
If we take 100 away from 101, we end up with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 20

Let's proceed to step 4:
20 goes into 12 0 times with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 450.0
Deduct 0 from 12 and we're left with 12.
Append the next digit (0) from the dividend to 12 and continue with: 120 / 20

Going ahead to step 5:
20 can be fit into 120 6 times, resulting in a remainder of 0.
The next digit of our result is 6. 
Result so far: 4506.0
Subtract 120 from 120 to get 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 20

Advancing to step 6:
If we divide 4 by 20, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 45060.0
If we take 0 away from 4, we end up with 4.
Append the next digit (8) from the dividend to 4 and continue with: 48 / 20

Let's proceed to step 7:
20 goes into 48 2 times with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 450602.0
Subtracting 40 from 48 leaves us with 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 20

Going ahead to step 8:
The number 20 fits into 81 4 times, leaving a remainder of 1.
The next digit of our result is 4. 
Result so far: 4506024.0
Subtracting 80 from 81 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 9:
20 can be fit into 10 0 times, resulting in a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 4506024.0
Subtract 0 from 10 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.

Going ahead to step 10:
20 can be fit into 100 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 4506024.05
Subtract 100 from 100 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.

On to step 11:
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: 4506024.05
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 12:
20 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 4506024.05
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 4506024.05, with a leftover of 0.0.