621873 divided by 20 
We want to figure out the number of times 621873 can be divided by 20.

On to step 1:
When dividing 6 by 20, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 20

Going ahead to step 2:
If we divide 62 by 20, we get 3 and a remainder of 2.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 60 from 62 leaves us with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 20

Moving on to step 3:
If we divide 21 by 20, we get 1 and a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 31.0
If we subtract 20 from 21, we get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 20

Step 4:
The number 20 fits into 18 0 times, leaving a remainder of 18.
The next digit of our result is 0. 
Result so far: 310.0
If we take 0 away from 18, we end up with 18.
Include the next digit (7) from the dividend after 18, then repeat: 187 / 20

On to step 5:
20 can be fit into 187 9 times, resulting in a remainder of 7.
Use 9 as the next digit of our solution. 
Result so far: 3109.0
If we subtract 180 from 187, we get 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 20

Moving on to step 6:
20 can be fit into 73 3 times, resulting in a remainder of 13.
Put 3 as the next digit of the answer. 
Result so far: 31093.0
The remainder is 13 after subtracting 60 from 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 7:
If we divide 130 by 20, we get 6 and a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 31093.6
If we subtract 120 from 130, we 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.

Step 8:
20 can be fit into 100 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 31093.65
Deduct 100 from 100 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.

On to step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 31093.65
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.

On to step 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 31093.65
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.

After the division, we end up with 31093.65 and a remainder of 0.0.