We're dividing 671836 by 20 
The aim is to understand the frequency of 20 in 671836.

Step 1:
If we divide 6 by 20, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (7) from the dividend, attach it to 6 and continue: 67 / 20

Moving on to step 2:
20 can be fit into 67 3 times, resulting in a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 60 away from 67, we end up with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 20

Moving on to step 3:
20 can be fit into 71 3 times, resulting in a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 33.0
If we take 60 away from 71, we end up with 11.
Grab the next digit (8) from the dividend, add it to 11, then carry on: 118 / 20

Going ahead to step 4:
20 goes into 118 5 times with a remainder of 18.
Use 5 as the next digit of our solution. 
Result so far: 335.0
If we take 100 away from 118, we end up with 18.
Grab the next digit (3) from the dividend, add it to 18, then carry on: 183 / 20

Step 5:
When dividing 183 by 20, we get 9 with a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 3359.0
Deduct 180 from 183 and we're left with 3.
Include the next digit (6) from the dividend after 3, then repeat: 36 / 20

Let's proceed to step 6:
If we divide 36 by 20, we get 1 and a remainder of 16.
Use 1 as the next digit of our solution. 
Result so far: 33591.0
If we subtract 20 from 36, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 7:
20 can be fit into 160 8 times, resulting in a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 33591.8
Subtracting 160 from 160 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 8:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 33591.8
Deduct 0 from 0 and we're left 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.

Advancing to step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 33591.8
If we subtract 0 from 0, we get 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 quotient of the division is 33591.8, and the remainder is 0.0.