20798520 divided by 644 
We want to figure out the number of times 20798520 can be divided by 644.

On to step 1:
2 divided by 644 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 644

Advancing to step 2:
20 divided by 644 is 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 20, we end up with 20.
Fetch the next digit (7) from the dividend, attach it to 20 and continue: 207 / 644

Advancing to step 3:
If we divide 207 by 644, we get 0 and a remainder of 207.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 207 and we're left with 207.
Bring next digit (9) of the dividend behind the 207 and repeat the process: 2079 / 644

Going ahead to step 4:
2079 divided by 644 is 3 with a remainder of 147.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 1932 from 2079 to get 147.
Fetch the next digit (8) from the dividend, attach it to 147 and continue: 1478 / 644

Advancing to step 5:
When dividing 1478 by 644, we get 2 with a remainder of 190.
Write down 2 as next digit of the result. 
Result so far: 32.0
Subtract 1288 from 1478 to get 190.
Fetch the next digit (5) from the dividend, attach it to 190 and continue: 1905 / 644

Moving on to step 6:
644 goes into 1905 2 times with a remainder of 617.
Use 2 as the next digit of our solution. 
Result so far: 322.0
Subtract 1288 from 1905 to get 617.
Grab the next digit (2) from the dividend, add it to 617, then carry on: 6172 / 644

Moving on to step 7:
644 goes into 6172 9 times with a remainder of 376.
Write down 9 as next digit of the result. 
Result so far: 3229.0
The remainder is 376 after subtracting 5796 from 6172.
Append the next digit (0) from the dividend to 376 and continue with: 3760 / 644

On to step 8:
When dividing 3760 by 644, we get 5 with a remainder of 540.
Record the quotient 5 as the next digit in the result. 
Result so far: 32295.0
Subtracting 3220 from 3760 leaves us with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Step 9:
If we divide 5400 by 644, we get 8 and a remainder of 248.
The number 8 becomes the next digit in our result. 
Result so far: 32295.8
If we subtract 5152 from 5400, we get 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Step 10:
If we divide 2480 by 644, we get 3 and a remainder of 548.
Record the quotient 3 as the next digit in the result. 
Result so far: 32295.83
If we take 1932 away from 2480, we end up with 548.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5480, and continue the process.

Let's proceed to step 11:
5480 divided by 644 is 8 with a remainder of 328.
Put 8 as the next digit of the answer. 
Result so far: 32295.838
Subtracting 5152 from 5480 leaves us with 328.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

Moving on to step 12:
3280 divided by 644 is 5 with a remainder of 60.
Put 5 as the next digit of the answer. 
Result so far: 32295.8385
Subtracting 3220 from 3280 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 13:
The number 644 fits into 600 0 times, leaving a remainder of 600.
The next digit of our result is 0. 
Result so far: 32295.8385
If we take 0 away from 600, we end up with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Going ahead to step 14:
644 goes into 6000 9 times with a remainder of 204.
Use 9 as the next digit of our solution. 
Result so far: 32295.838509
Subtract 5796 from 6000 to get 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Going ahead to step 15:
644 goes into 2040 3 times with a remainder of 108.
The number 3 becomes the next digit in our result. 
Result so far: 32295.8385093
If we take 1932 away from 2040, we end up with 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Moving on to step 16:
If we divide 1080 by 644, we get 1 and a remainder of 436.
Write down 1 as next digit of the result. 
Result so far: 32295.83850931
Subtract 644 from 1080 to get 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

In conclusion, the division gives 32295.83850931 with a balance of 4.36e-07.