644571 divided by 31 
We want to figure out the number of times 644571 can be divided by 31.

Moving on to step 1:
31 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 31

Let's proceed to step 2:
When dividing 64 by 31, we get 2 with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 62 from 64 and we're left with 2.
Include the next digit (4) from the dividend after 2, then repeat: 24 / 31

Going ahead to step 3:
If we divide 24 by 31, we get 0 and a remainder of 24.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
If we subtract 0 from 24, we get 24.
Grab the next digit (5) from the dividend, add it to 24, then carry on: 245 / 31

Advancing to step 4:
31 goes into 245 7 times with a remainder of 28.
The number 7 becomes the next digit in our result. 
Result so far: 207.0
The remainder is 28 after subtracting 217 from 245.
Include the next digit (7) from the dividend after 28, then repeat: 287 / 31

Advancing to step 5:
When dividing 287 by 31, we get 9 with a remainder of 8.
The next digit of our result is 9. 
Result so far: 2079.0
If we take 279 away from 287, we end up with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 31

Let's proceed to step 6:
If we divide 81 by 31, we get 2 and a remainder of 19.
The next digit of our result is 2. 
Result so far: 20792.0
Subtract 62 from 81 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 7:
The number 31 fits into 190 6 times, leaving a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 20792.6
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 8:
31 can be fit into 40 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 20792.61
If we subtract 31 from 40, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 9:
When dividing 90 by 31, we get 2 with a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 20792.612
The remainder is 28 after subtracting 62 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 10:
If we divide 280 by 31, we get 9 and a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 20792.6129
Subtract 279 from 280 to get 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 11:
31 goes into 10 0 times with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 20792.6129
Subtract 0 from 10 to get 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 12:
100 divided by 31 is 3 with a remainder of 7.
The next digit of our result is 3. 
Result so far: 20792.612903
If we take 93 away from 100, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 13:
31 goes into 70 2 times with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 20792.6129032
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.

Advancing to step 14:
80 divided by 31 is 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 20792.61290322
Subtract 62 from 80 to 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.

Our division results in 20792.61290322 with a remaining 1.8e-08.