644716 ÷ 31 
Our goal is to divide 644716 by 31.

Step 1:
31 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 31

Step 2:
The number 31 fits into 64 2 times, leaving a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 2 after subtracting 62 from 64.
Grab the next digit (4) from the dividend, add it to 2, then carry on: 24 / 31

Let's proceed to step 3:
31 goes into 24 0 times with a remainder of 24.
Write down 0 as next digit of the result. 
Result so far: 20.0
Subtract 0 from 24 to get 24.
Bring next digit (7) of the dividend behind the 24 and repeat the process: 247 / 31

On to step 4:
31 can be fit into 247 7 times, resulting in a remainder of 30.
The number 7 becomes the next digit in our result. 
Result so far: 207.0
Deduct 217 from 247 and we're left with 30.
Grab the next digit (1) from the dividend, add it to 30, then carry on: 301 / 31

Advancing to step 5:
When dividing 301 by 31, we get 9 with a remainder of 22.
The number 9 becomes the next digit in our result. 
Result so far: 2079.0
If we subtract 279 from 301, we get 22.
Append the next digit (6) from the dividend to 22 and continue with: 226 / 31

Moving on to step 6:
226 divided by 31 is 7 with a remainder of 9.
The number 7 becomes the next digit in our result. 
Result so far: 20797.0
If we take 217 away from 226, we end up 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.

On to step 7:
31 can be fit into 90 2 times, resulting in a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 20797.2
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.

Let's proceed to step 8:
The number 31 fits into 280 9 times, leaving a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 20797.29
Subtracting 279 from 280 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 9:
When dividing 10 by 31, we get 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 20797.29
Subtracting 0 from 10 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.

Let's proceed to step 10:
100 divided by 31 is 3 with a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 20797.2903
Subtract 93 from 100 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 11:
31 can be fit into 70 2 times, resulting in a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 20797.29032
The remainder is 8 after subtracting 62 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 12:
When dividing 80 by 31, we get 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 20797.290322
If we subtract 62 from 80, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

In conclusion, the division gives 20797.290322 with a balance of 1.8e-06.