We divide 858799 by 20
Let's see how many times 20 fits into 858799.

Advancing to step 1:
When dividing 8 by 20, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 20

Advancing to step 2:
20 can be fit into 85 4 times, resulting in a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 80 away from 85, we end up with 5.
Grab the next digit (8) from the dividend, add it to 5, then carry on: 58 / 20

Advancing to step 3:
58 divided by 20 is 2 with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 42.0
Subtract 40 from 58 to get 18.
Take the next digit (7) from the dividend and append it to 18, then repeat: 187 / 20

Let's proceed to step 4:
If we divide 187 by 20, we get 9 and a remainder of 7.
Record the quotient 9 as the next digit in the result. 
Result so far: 429.0
The remainder is 7 after subtracting 180 from 187.
Take the next digit (9) from the dividend and append it to 7, then repeat: 79 / 20

Moving on to step 5:
The number 20 fits into 79 3 times, leaving a remainder of 19.
Put 3 as the next digit of the answer. 
Result so far: 4293.0
The remainder is 19 after subtracting 60 from 79.
Bring next digit (9) of the dividend behind the 19 and repeat the process: 199 / 20

On to step 6:
20 can be fit into 199 9 times, resulting in a remainder of 19.
Put 9 as the next digit of the answer. 
Result so far: 42939.0
Deduct 180 from 199 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 7:
The number 20 fits into 190 9 times, leaving a remainder of 10.
Put 9 as the next digit of the answer. 
Result so far: 42939.9
If we subtract 180 from 190, 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.

Moving on 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: 42939.95
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.

Moving on to step 9:
20 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 42939.95
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 10:
When dividing 0 by 20, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 42939.95
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 final result is 42939.95 with a remainder of 0.0.