20866704 divided by 13 
The aim is to understand the frequency of 13 in 20866704.

Moving on to step 1:
If we divide 2 by 13, we get 0 and a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 13

Step 2:
20 divided by 13 is 1 with a remainder of 7.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 13 from 20 leaves us with 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 13

On to step 3:
13 goes into 78 6 times with a remainder of 0.
The next digit of our result is 6. 
Result so far: 16.0
Deduct 78 from 78 and we're left with 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 13

Step 4:
When dividing 6 by 13, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 160.0
Subtract 0 from 6 to get 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 13

Going ahead to step 5:
When dividing 66 by 13, we get 5 with a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 1605.0
The remainder is 1 after subtracting 65 from 66.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 13

Going ahead to step 6:
If we divide 17 by 13, we get 1 and a remainder of 4.
Use 1 as the next digit of our solution. 
Result so far: 16051.0
Subtracting 13 from 17 leaves us with 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 13

Let's proceed to step 7:
When dividing 40 by 13, we get 3 with a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 160513.0
If we take 39 away from 40, we end up with 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 13

Moving on to step 8:
The number 13 fits into 14 1 times, leaving a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 1605131.0
If we take 13 away from 14, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 9:
When dividing 10 by 13, we get 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 1605131.0
If we take 0 away from 10, we end up 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.

Going ahead to step 10:
13 can be fit into 100 7 times, resulting in a remainder of 9.
The next digit of our result is 7. 
Result so far: 1605131.07
The remainder is 9 after subtracting 91 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 11:
The number 13 fits into 90 6 times, leaving a remainder of 12.
The next digit of our result is 6. 
Result so far: 1605131.076
Deduct 78 from 90 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 12:
The number 13 fits into 120 9 times, leaving a remainder of 3.
The next digit of our result is 9. 
Result so far: 1605131.0769
If we subtract 117 from 120, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 13:
30 divided by 13 is 2 with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 1605131.07692
If we subtract 26 from 30, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 14:
The number 13 fits into 40 3 times, leaving a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 1605131.076923
Subtracting 39 from 40 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 15:
13 can be fit into 10 0 times, resulting in a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 1605131.076923
Subtracting 0 from 10 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.

Moving on to step 16:
13 goes into 100 7 times with a remainder of 9.
Record the quotient 7 as the next digit in the result. 
Result so far: 1605131.07692307
The remainder is 9 after subtracting 91 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

After the division, we end up with 1605131.07692307 and a remainder of 9e-09.