858051 ÷ 20 
Our goal is to divide 858051 by 20.

On to step 1:
8 divided by 20 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 20

Advancing to step 2:
The number 20 fits into 85 4 times, leaving a remainder of 5.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 80 from 85 and we're left with 5.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 20

Going ahead to step 3:
If we divide 58 by 20, we get 2 and a remainder of 18.
The next digit of our result is 2. 
Result so far: 42.0
The remainder is 18 after subtracting 40 from 58.
Grab the next digit (0) from the dividend, add it to 18, then carry on: 180 / 20

Step 4:
When dividing 180 by 20, we get 9 with a remainder of 0.
Write down 9 as next digit of the result. 
Result so far: 429.0
Deduct 180 from 180 and we're left with 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 20

Advancing to step 5:
If we divide 5 by 20, we get 0 and a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 4290.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 20

Going ahead to step 6:
51 divided by 20 is 2 with a remainder of 11.
Write down 2 as next digit of the result. 
Result so far: 42902.0
The remainder is 11 after subtracting 40 from 51.
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.
The next digit of our result is 5. 
Result so far: 42902.5
Subtracting 100 from 110 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
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: 42902.55
If we take 100 away from 100, we end up 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.

After the division, we end up with 42902.55 and a remainder of 0.0.