We look at the division of 20957161 by 315 
The aim is to understand the frequency of 315 in 20957161.

Let's proceed to step 1:
When dividing 2 by 315, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 315

Going ahead to step 2:
The number 315 fits into 20 0 times, leaving a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 20, we get 20.
Grab the next digit (9) from the dividend, add it to 20, then carry on: 209 / 315

Moving on to step 3:
315 can be fit into 209 0 times, resulting in a remainder of 209.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 209, we get 209.
Bring next digit (5) of the dividend behind the 209 and repeat the process: 2095 / 315

Advancing to step 4:
The number 315 fits into 2095 6 times, leaving a remainder of 205.
The next digit of our result is 6. 
Result so far: 6.0
If we take 1890 away from 2095, we end up with 205.
Append the next digit (7) from the dividend to 205 and continue with: 2057 / 315

Moving on to step 5:
315 goes into 2057 6 times with a remainder of 167.
Record the quotient 6 as the next digit in the result. 
Result so far: 66.0
The remainder is 167 after subtracting 1890 from 2057.
Fetch the next digit (1) from the dividend, attach it to 167 and continue: 1671 / 315

Advancing to step 6:
When dividing 1671 by 315, we get 5 with a remainder of 96.
Put 5 as the next digit of the answer. 
Result so far: 665.0
If we subtract 1575 from 1671, we get 96.
Bring next digit (6) of the dividend behind the 96 and repeat the process: 966 / 315

Advancing to step 7:
If we divide 966 by 315, we get 3 and a remainder of 21.
The next digit of our result is 3. 
Result so far: 6653.0
Subtracting 945 from 966 leaves us with 21.
Take the next digit (1) from the dividend and append it to 21, then repeat: 211 / 315

Going ahead to step 8:
If we divide 211 by 315, we get 0 and a remainder of 211.
Record the quotient 0 as the next digit in the result. 
Result so far: 66530.0
Deduct 0 from 211 and we're left with 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Step 9:
2110 divided by 315 is 6 with a remainder of 220.
The number 6 becomes the next digit in our result. 
Result so far: 66530.6
Deduct 1890 from 2110 and we're left with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

On to step 10:
2200 divided by 315 is 6 with a remainder of 310.
The number 6 becomes the next digit in our result. 
Result so far: 66530.66
Subtracting 1890 from 2200 leaves us with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

After the division, we end up with 66530.66 and a remainder of 0.31.