We divide 20366371 by 391
The aim is to understand the frequency of 391 in 20366371.

Moving on to step 1:
2 divided by 391 is 0 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 / 391

Going ahead to step 2:
391 goes into 20 0 times with a remainder of 20.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 20, we end up with 20.
Include the next digit (3) from the dividend after 20, then repeat: 203 / 391

On to step 3:
391 can be fit into 203 0 times, resulting in a remainder of 203.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 203, we get 203.
Append the next digit (6) from the dividend to 203 and continue with: 2036 / 391

On to step 4:
2036 divided by 391 is 5 with a remainder of 81.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we subtract 1955 from 2036, we get 81.
Take the next digit (6) from the dividend and append it to 81, then repeat: 816 / 391

Going ahead to step 5:
391 can be fit into 816 2 times, resulting in a remainder of 34.
Write down 2 as next digit of the result. 
Result so far: 52.0
Subtracting 782 from 816 leaves us with 34.
Grab the next digit (3) from the dividend, add it to 34, then carry on: 343 / 391

On to step 6:
343 divided by 391 is 0 with a remainder of 343.
Put 0 as the next digit of the answer. 
Result so far: 520.0
If we subtract 0 from 343, we get 343.
Append the next digit (7) from the dividend to 343 and continue with: 3437 / 391

On to step 7:
391 can be fit into 3437 8 times, resulting in a remainder of 309.
The number 8 becomes the next digit in our result. 
Result so far: 5208.0
If we take 3128 away from 3437, we end up with 309.
Include the next digit (1) from the dividend after 309, then repeat: 3091 / 391

Let's proceed to step 8:
If we divide 3091 by 391, we get 7 and a remainder of 354.
The number 7 becomes the next digit in our result. 
Result so far: 52087.0
If we take 2737 away from 3091, we end up with 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Step 9:
391 goes into 3540 9 times with a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 52087.9
Subtract 3519 from 3540 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 10:
391 goes into 210 0 times with a remainder of 210.
Put 0 as the next digit of the answer. 
Result so far: 52087.9
The remainder is 210 after subtracting 0 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Let's proceed to step 11:
391 goes into 2100 5 times with a remainder of 145.
Record the quotient 5 as the next digit in the result. 
Result so far: 52087.905
Deduct 1955 from 2100 and we're left with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

On to step 12:
If we divide 1450 by 391, we get 3 and a remainder of 277.
The next digit of our result is 3. 
Result so far: 52087.9053
Deduct 1173 from 1450 and we're left with 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Let's proceed to step 13:
If we divide 2770 by 391, we get 7 and a remainder of 33.
Use 7 as the next digit of our solution. 
Result so far: 52087.90537
Subtract 2737 from 2770 to get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 14:
The number 391 fits into 330 0 times, leaving a remainder of 330.
Put 0 as the next digit of the answer. 
Result so far: 52087.90537
Subtracting 0 from 330 leaves us with 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Step 15:
391 goes into 3300 8 times with a remainder of 172.
Write down 8 as next digit of the result. 
Result so far: 52087.9053708
If we take 3128 away from 3300, we end up with 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Step 16:
The number 391 fits into 1720 4 times, leaving a remainder of 156.
The next digit of our result is 4. 
Result so far: 52087.90537084
Deduct 1564 from 1720 and we're left with 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

The final result is 52087.90537084 with a remainder of 1.56e-07.