868645 divided by 20 
The aim is to understand the frequency of 20 in 868645.

Step 1:
The number 20 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 20

Going ahead to step 2:
86 divided by 20 is 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 80 from 86 and we're left with 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 20

Going ahead to step 3:
68 divided by 20 is 3 with a remainder of 8.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
If we subtract 60 from 68, we get 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 20

Let's proceed to step 4:
20 goes into 86 4 times with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 434.0
If we take 80 away from 86, we end up with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 20

Let's proceed to step 5:
64 divided by 20 is 3 with a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 4343.0
The remainder is 4 after subtracting 60 from 64.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 20

Advancing to step 6:
If we divide 45 by 20, we get 2 and a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 43432.0
The remainder is 5 after subtracting 40 from 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 7:
20 can be fit into 50 2 times, resulting in a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 43432.2
Subtract 40 from 50 to get 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 8:
100 divided by 20 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 43432.25
Subtracting 100 from 100 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 43432.25
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
20 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 43432.25
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 43432.25, with a leftover of 0.0.