621556 divided by 20 
We want to figure out the number of times 621556 can be divided by 20.

On to step 1:
20 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 20

Going ahead to step 2:
20 goes into 62 3 times with a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 60 from 62 and we're left with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 20

Going ahead to step 3:
If we divide 21 by 20, we get 1 and a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 31.0
Deduct 20 from 21 and we're left with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 20

Advancing to step 4:
If we divide 15 by 20, we get 0 and a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 310.0
Deduct 0 from 15 and we're left with 15.
Bring next digit (5) of the dividend behind the 15 and repeat the process: 155 / 20

Let's proceed to step 5:
20 goes into 155 7 times with a remainder of 15.
Record the quotient 7 as the next digit in the result. 
Result so far: 3107.0
If we take 140 away from 155, we end up with 15.
Take the next digit (6) from the dividend and append it to 15, then repeat: 156 / 20

Moving on to step 6:
20 can be fit into 156 7 times, resulting in a remainder of 16.
The next digit of our result is 7. 
Result so far: 31077.0
Subtracting 140 from 156 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 7:
20 can be fit into 160 8 times, resulting in a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 31077.8
If we take 160 away from 160, 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.

On to step 8:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 31077.8
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 9:
If we divide 0 by 20, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 31077.8
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.

Our division results in 31077.8 with a remaining 0.0.