623640 divided by 20 
Let's see how many times 20 fits into 623640.

Going ahead to step 1:
20 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 20

Moving on to step 2:
62 divided by 20 is 3 with a remainder of 2.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 60 from 62 and we're left with 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 20

Going ahead to step 3:
23 divided by 20 is 1 with a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 31.0
Subtract 20 from 23 to get 3.
Append the next digit (6) from the dividend to 3 and continue with: 36 / 20

Going ahead to step 4:
20 goes into 36 1 times with a remainder of 16.
The next digit of our result is 1. 
Result so far: 311.0
If we subtract 20 from 36, we get 16.
Append the next digit (4) from the dividend to 16 and continue with: 164 / 20

Going ahead to step 5:
164 divided by 20 is 8 with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 3118.0
Deduct 160 from 164 and we're left with 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 20

Going ahead to step 6:
40 divided by 20 is 2 with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 31182.0
The remainder is 0 after subtracting 40 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
0 divided by 20 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 31182.0
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.

Moving on to step 8:
20 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 31182.0
If we take 0 away from 0, we end up 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 31182.0 with a remaining 0.0.