20780163 ÷ 646 
The aim is to understand the frequency of 646 in 20780163.

Let's proceed to step 1:
646 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 646

Moving on to step 2:
If we divide 20 by 646, we get 0 and a remainder of 20.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 20 to get 20.
Grab the next digit (7) from the dividend, add it to 20, then carry on: 207 / 646

Going ahead to step 3:
207 divided by 646 is 0 with a remainder of 207.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 207, we end up with 207.
Bring next digit (8) of the dividend behind the 207 and repeat the process: 2078 / 646

Step 4:
2078 divided by 646 is 3 with a remainder of 140.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we take 1938 away from 2078, we end up with 140.
Take the next digit (0) from the dividend and append it to 140, then repeat: 1400 / 646

Advancing to step 5:
1400 divided by 646 is 2 with a remainder of 108.
Write down 2 as next digit of the result. 
Result so far: 32.0
If we subtract 1292 from 1400, we get 108.
Append the next digit (1) from the dividend to 108 and continue with: 1081 / 646

Moving on to step 6:
If we divide 1081 by 646, we get 1 and a remainder of 435.
Use 1 as the next digit of our solution. 
Result so far: 321.0
The remainder is 435 after subtracting 646 from 1081.
Take the next digit (6) from the dividend and append it to 435, then repeat: 4356 / 646

Let's proceed to step 7:
The number 646 fits into 4356 6 times, leaving a remainder of 480.
Put 6 as the next digit of the answer. 
Result so far: 3216.0
If we take 3876 away from 4356, we end up with 480.
Grab the next digit (3) from the dividend, add it to 480, then carry on: 4803 / 646

Going ahead to step 8:
4803 divided by 646 is 7 with a remainder of 281.
The next digit of our result is 7. 
Result so far: 32167.0
Deduct 4522 from 4803 and we're left with 281.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2810, and continue the process.

Going ahead to step 9:
The number 646 fits into 2810 4 times, leaving a remainder of 226.
Record the quotient 4 as the next digit in the result. 
Result so far: 32167.4
If we take 2584 away from 2810, we end up with 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

Let's proceed to step 10:
2260 divided by 646 is 3 with a remainder of 322.
Use 3 as the next digit of our solution. 
Result so far: 32167.43
Deduct 1938 from 2260 and we're left with 322.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3220, and continue the process.

Moving on to step 11:
The number 646 fits into 3220 4 times, leaving a remainder of 636.
Put 4 as the next digit of the answer. 
Result so far: 32167.434
If we subtract 2584 from 3220, we get 636.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6360, and continue the process.

Let's proceed to step 12:
When dividing 6360 by 646, we get 9 with a remainder of 546.
The next digit of our result is 9. 
Result so far: 32167.4349
If we subtract 5814 from 6360, we get 546.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5460, and continue the process.

Going ahead to step 13:
The number 646 fits into 5460 8 times, leaving a remainder of 292.
Put 8 as the next digit of the answer. 
Result so far: 32167.43498
If we subtract 5168 from 5460, we get 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Moving on to step 14:
If we divide 2920 by 646, we get 4 and a remainder of 336.
Write down 4 as next digit of the result. 
Result so far: 32167.434984
Subtracting 2584 from 2920 leaves us with 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Step 15:
646 can be fit into 3360 5 times, resulting in a remainder of 130.
The next digit of our result is 5. 
Result so far: 32167.4349845
Subtracting 3230 from 3360 leaves us with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Advancing to step 16:
1300 divided by 646 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 32167.43498452
Subtract 1292 from 1300 to 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.

In conclusion, the division gives 32167.43498452 with a balance of 8e-09.