We look at the division of 904635 by 20 
We're looking to find how many times 20 goes into 904635.

Step 1:
9 divided by 20 is 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 20

On 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
Subtract 80 from 90 to get 10.
Grab the next digit (4) from the dividend, add it to 10, then carry on: 104 / 20

Going ahead to step 3:
104 divided by 20 is 5 with a remainder of 4.
The number 5 becomes the next digit in our result. 
Result so far: 45.0
Subtract 100 from 104 to get 4.
Bring next digit (6) of the dividend behind the 4 and repeat the process: 46 / 20

Step 4:
20 goes into 46 2 times with a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 452.0
The remainder is 6 after subtracting 40 from 46.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 20

Advancing to step 5:
If we divide 63 by 20, we get 3 and a remainder of 3.
The next digit of our result is 3. 
Result so far: 4523.0
The remainder is 3 after subtracting 60 from 63.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 20

Moving on to step 6:
When dividing 35 by 20, we get 1 with a remainder of 15.
Put 1 as the next digit of the answer. 
Result so far: 45231.0
Subtract 20 from 35 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 7:
20 goes into 150 7 times with a remainder of 10.
Write down 7 as next digit of the result. 
Result so far: 45231.7
Subtract 140 from 150 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.

Step 8:
20 can be fit into 100 5 times, resulting in a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 45231.75
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:
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: 45231.75
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.

Step 10:
If we divide 0 by 20, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 45231.75
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 45231.75, with a leftover of 0.0.