We look at the division of 639457 by 31 
Let's see how many times 31 fits into 639457.

On to step 1:
6 divided by 31 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 31

Step 2:
If we divide 63 by 31, we get 2 and a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 62 away from 63, we end up with 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 31

Going ahead to step 3:
31 can be fit into 19 0 times, resulting in a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 20.0
The remainder is 19 after subtracting 0 from 19.
Fetch the next digit (4) from the dividend, attach it to 19 and continue: 194 / 31

Let's proceed to step 4:
If we divide 194 by 31, we get 6 and a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 206.0
Subtracting 186 from 194 leaves us with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 31

Moving on to step 5:
31 goes into 85 2 times with a remainder of 23.
Write down 2 as next digit of the result. 
Result so far: 2062.0
Deduct 62 from 85 and we're left with 23.
Grab the next digit (7) from the dividend, add it to 23, then carry on: 237 / 31

Advancing to step 6:
If we divide 237 by 31, we get 7 and a remainder of 20.
Put 7 as the next digit of the answer. 
Result so far: 20627.0
Subtract 217 from 237 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 7:
If we divide 200 by 31, we get 6 and a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 20627.6
If we subtract 186 from 200, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 8:
140 divided by 31 is 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 20627.64
If we subtract 124 from 140, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 9:
31 can be fit into 160 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 20627.645
If we take 155 away from 160, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 10:
31 can be fit into 50 1 times, resulting in a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 20627.6451
If we take 31 away from 50, we end up 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.

Step 11:
31 goes into 190 6 times with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 20627.64516
Subtract 186 from 190 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 12:
31 can be fit into 40 1 times, resulting in a remainder of 9.
The next digit of our result is 1. 
Result so far: 20627.645161
Deduct 31 from 40 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 13:
31 goes into 90 2 times with a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 20627.6451612
If we subtract 62 from 90, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 14:
280 divided by 31 is 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 20627.64516129
The remainder is 1 after subtracting 279 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

In conclusion, the division gives 20627.64516129 with a balance of 1e-09.