We divide 639884 by 20
Let's see how many times 20 fits into 639884.

Advancing to step 1:
20 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 20

Advancing to step 2:
When dividing 63 by 20, we get 3 with a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 60 from 63 to get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 20

Going ahead to step 3:
If we divide 39 by 20, we get 1 and a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 31.0
If we subtract 20 from 39, we get 19.
Take the next digit (8) from the dividend and append it to 19, then repeat: 198 / 20

Let's proceed to step 4:
198 divided by 20 is 9 with a remainder of 18.
The number 9 becomes the next digit in our result. 
Result so far: 319.0
Subtract 180 from 198 to get 18.
Include the next digit (8) from the dividend after 18, then repeat: 188 / 20

Moving on to step 5:
If we divide 188 by 20, we get 9 and a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 3199.0
Subtracting 180 from 188 leaves us with 8.
Bring next digit (4) of the dividend behind the 8 and repeat the process: 84 / 20

Advancing to step 6:
When dividing 84 by 20, we get 4 with a remainder of 4.
Write down 4 as next digit of the result. 
Result so far: 31994.0
The remainder is 4 after subtracting 80 from 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 7:
The number 20 fits into 40 2 times, leaving a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 31994.2
If we subtract 40 from 40, 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.

Going ahead to step 8:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 31994.2
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 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 31994.2
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 31994.2 with a remaining 0.0.