We look at the division of 435831 by 20 
We want to figure out the number of times 435831 can be divided by 20.

Step 1:
If we divide 4 by 20, we get 0 and a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 20

Moving on to step 2:
20 can be fit into 43 2 times, resulting in a remainder of 3.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 40 from 43 leaves us with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 20

On to step 3:
20 goes into 35 1 times with a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 21.0
The remainder is 15 after subtracting 20 from 35.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 20

Advancing to step 4:
The number 20 fits into 158 7 times, leaving a remainder of 18.
Write down 7 as next digit of the result. 
Result so far: 217.0
The remainder is 18 after subtracting 140 from 158.
Include the next digit (3) from the dividend after 18, then repeat: 183 / 20

Going ahead to step 5:
The number 20 fits into 183 9 times, leaving a remainder of 3.
Write down 9 as next digit of the result. 
Result so far: 2179.0
Deduct 180 from 183 and we're left with 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 20

Advancing to step 6:
If we divide 31 by 20, we get 1 and a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 21791.0
The remainder is 11 after subtracting 20 from 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 7:
When dividing 110 by 20, we get 5 with a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 21791.5
If we subtract 100 from 110, we 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:
The number 20 fits into 100 5 times, leaving a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 21791.55
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.

After the division, we end up with 21791.55 and a remainder of 0.0.