20872570 ÷ 321 
Let's see how many times 321 fits into 20872570.

Going ahead to step 1:
321 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 321

Moving on to step 2:
321 goes into 20 0 times with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 20, we end up with 20.
Bring next digit (8) of the dividend behind the 20 and repeat the process: 208 / 321

On to step 3:
The number 321 fits into 208 0 times, leaving a remainder of 208.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 208, we get 208.
Append the next digit (7) from the dividend to 208 and continue with: 2087 / 321

Step 4:
2087 divided by 321 is 6 with a remainder of 161.
Write down 6 as next digit of the result. 
Result so far: 6.0
Deduct 1926 from 2087 and we're left with 161.
Append the next digit (2) from the dividend to 161 and continue with: 1612 / 321

Advancing to step 5:
321 can be fit into 1612 5 times, resulting in a remainder of 7.
The number 5 becomes the next digit in our result. 
Result so far: 65.0
If we subtract 1605 from 1612, we get 7.
Grab the next digit (5) from the dividend, add it to 7, then carry on: 75 / 321

Moving on to step 6:
If we divide 75 by 321, we get 0 and a remainder of 75.
The next digit of our result is 0. 
Result so far: 650.0
If we subtract 0 from 75, we get 75.
Include the next digit (7) from the dividend after 75, then repeat: 757 / 321

Advancing to step 7:
321 goes into 757 2 times with a remainder of 115.
Use 2 as the next digit of our solution. 
Result so far: 6502.0
If we subtract 642 from 757, we get 115.
Take the next digit (0) from the dividend and append it to 115, then repeat: 1150 / 321

On to step 8:
1150 divided by 321 is 3 with a remainder of 187.
The next digit of our result is 3. 
Result so far: 65023.0
Subtracting 963 from 1150 leaves us with 187.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

Let's proceed to step 9:
When dividing 1870 by 321, we get 5 with a remainder of 265.
Put 5 as the next digit of the answer. 
Result so far: 65023.5
If we subtract 1605 from 1870, we get 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Moving on to step 10:
The number 321 fits into 2650 8 times, leaving a remainder of 82.
The next digit of our result is 8. 
Result so far: 65023.58
If we take 2568 away from 2650, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

On to step 11:
If we divide 820 by 321, we get 2 and a remainder of 178.
The next digit of our result is 2. 
Result so far: 65023.582
The remainder is 178 after subtracting 642 from 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

Let's proceed to step 12:
The number 321 fits into 1780 5 times, leaving a remainder of 175.
Write down 5 as next digit of the result. 
Result so far: 65023.5825
Subtract 1605 from 1780 to get 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

Step 13:
If we divide 1750 by 321, we get 5 and a remainder of 145.
Use 5 as the next digit of our solution. 
Result so far: 65023.58255
If we subtract 1605 from 1750, we get 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

After the division, we end up with 65023.58255 and a remainder of 0.000145.