Let's divide 870394 by 20
We're looking to find how many times 20 goes into 870394.

Moving on to step 1:
When dividing 8 by 20, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 20

Moving on to step 2:
When dividing 87 by 20, we get 4 with a remainder of 7.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 80 from 87 to get 7.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 20

Moving on to step 3:
If we divide 70 by 20, we get 3 and a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
The remainder is 10 after subtracting 60 from 70.
Include the next digit (3) from the dividend after 10, then repeat: 103 / 20

On to step 4:
20 can be fit into 103 5 times, resulting in a remainder of 3.
Use 5 as the next digit of our solution. 
Result so far: 435.0
Deduct 100 from 103 and we're left with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 20

Moving on to step 5:
The number 20 fits into 39 1 times, leaving a remainder of 19.
The next digit of our result is 1. 
Result so far: 4351.0
The remainder is 19 after subtracting 20 from 39.
Append the next digit (4) from the dividend to 19 and continue with: 194 / 20

Going ahead to step 6:
20 can be fit into 194 9 times, resulting in a remainder of 14.
The next digit of our result is 9. 
Result so far: 43519.0
Deduct 180 from 194 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 7:
The number 20 fits into 140 7 times, leaving a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 43519.7
Subtract 140 from 140 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.

Let's proceed to step 8:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 43519.7
If we take 0 away from 0, 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.

Advancing 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: 43519.7
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.

Our division results in 43519.7 with a remaining 0.0.