We're dividing 20544830 by 81 
The aim is to understand the frequency of 81 in 20544830.

Moving on to step 1:
81 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 81

Moving on to step 2:
If we divide 20 by 81, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 20 and we're left with 20.
Grab the next digit (5) from the dividend, add it to 20, then carry on: 205 / 81

On to step 3:
If we divide 205 by 81, we get 2 and a remainder of 43.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 162 from 205, we get 43.
Include the next digit (4) from the dividend after 43, then repeat: 434 / 81

Step 4:
434 divided by 81 is 5 with a remainder of 29.
Put 5 as the next digit of the answer. 
Result so far: 25.0
Subtract 405 from 434 to get 29.
Include the next digit (4) from the dividend after 29, then repeat: 294 / 81

Step 5:
When dividing 294 by 81, we get 3 with a remainder of 51.
Write down 3 as next digit of the result. 
Result so far: 253.0
Deduct 243 from 294 and we're left with 51.
Bring next digit (8) of the dividend behind the 51 and repeat the process: 518 / 81

Let's proceed to step 6:
The number 81 fits into 518 6 times, leaving a remainder of 32.
The next digit of our result is 6. 
Result so far: 2536.0
If we subtract 486 from 518, we get 32.
Take the next digit (3) from the dividend and append it to 32, then repeat: 323 / 81

Let's proceed to step 7:
When dividing 323 by 81, we get 3 with a remainder of 80.
The next digit of our result is 3. 
Result so far: 25363.0
Deduct 243 from 323 and we're left with 80.
Include the next digit (0) from the dividend after 80, then repeat: 800 / 81

Let's proceed to step 8:
800 divided by 81 is 9 with a remainder of 71.
The next digit of our result is 9. 
Result so far: 253639.0
Subtract 729 from 800 to get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Moving on to step 9:
710 divided by 81 is 8 with a remainder of 62.
The next digit of our result is 8. 
Result so far: 253639.8
The remainder is 62 after subtracting 648 from 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 10:
When dividing 620 by 81, we get 7 with a remainder of 53.
Write down 7 as next digit of the result. 
Result so far: 253639.87
Subtracting 567 from 620 leaves us with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

On to step 11:
530 divided by 81 is 6 with a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 253639.876
If we take 486 away from 530, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 12:
When dividing 440 by 81, we get 5 with a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 253639.8765
Subtract 405 from 440 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 13:
81 can be fit into 350 4 times, resulting in a remainder of 26.
The next digit of our result is 4. 
Result so far: 253639.87654
If we subtract 324 from 350, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 14:
The number 81 fits into 260 3 times, leaving a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 253639.876543
If we take 243 away from 260, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 15:
81 goes into 170 2 times with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 253639.8765432
If we subtract 162 from 170, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 16:
80 divided by 81 is 0 with a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 253639.8765432
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

In conclusion, the division gives 253639.8765432 with a balance of 8e-08.