Let's divide 87872051 by 20
We want to figure out the number of times 87872051 can be divided by 20.

On to step 1:
20 goes into 8 0 times with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 20

Going ahead to step 2:
20 goes into 87 4 times with a remainder of 7.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we subtract 80 from 87, we get 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 20

Let's proceed to step 3:
When dividing 78 by 20, we get 3 with a remainder of 18.
Record the quotient 3 as the next digit in the result. 
Result so far: 43.0
If we take 60 away from 78, we end up with 18.
Fetch the next digit (7) from the dividend, attach it to 18 and continue: 187 / 20

Going ahead to step 4:
187 divided by 20 is 9 with a remainder of 7.
Use 9 as the next digit of our solution. 
Result so far: 439.0
If we subtract 180 from 187, we get 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 20

Moving on to step 5:
If we divide 72 by 20, we get 3 and a remainder of 12.
The next digit of our result is 3. 
Result so far: 4393.0
Deduct 60 from 72 and we're left with 12.
Include the next digit (0) from the dividend after 12, then repeat: 120 / 20

Moving on to step 6:
The number 20 fits into 120 6 times, leaving a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 43936.0
Subtract 120 from 120 to get 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 20

Going ahead to step 7:
5 divided by 20 is 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 439360.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 20

On to step 8:
20 goes into 51 2 times with a remainder of 11.
The next digit of our result is 2. 
Result so far: 4393602.0
Deduct 40 from 51 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 9:
When dividing 110 by 20, we get 5 with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 4393602.5
Subtracting 100 from 110 leaves us with 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 10:
When dividing 100 by 20, we get 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 4393602.55
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.

The quotient of the division is 4393602.55, and the remainder is 0.0.