We're dividing 643317 by 20 
We're looking to find how many times 20 goes into 643317.

Let's proceed to step 1:
If we divide 6 by 20, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 20

Going ahead to step 2:
20 can be fit into 64 3 times, resulting in a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 60 from 64 leaves us with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 20

Let's proceed to step 3:
20 goes into 43 2 times with a remainder of 3.
Record the quotient 2 as the next digit in the result. 
Result so far: 32.0
Subtract 40 from 43 to get 3.
Include the next digit (3) from the dividend after 3, then repeat: 33 / 20

Going ahead to step 4:
20 can be fit into 33 1 times, resulting in a remainder of 13.
Record the quotient 1 as the next digit in the result. 
Result so far: 321.0
The remainder is 13 after subtracting 20 from 33.
Grab the next digit (1) from the dividend, add it to 13, then carry on: 131 / 20

Step 5:
If we divide 131 by 20, we get 6 and a remainder of 11.
The number 6 becomes the next digit in our result. 
Result so far: 3216.0
The remainder is 11 after subtracting 120 from 131.
Include the next digit (7) from the dividend after 11, then repeat: 117 / 20

Moving on to step 6:
The number 20 fits into 117 5 times, leaving a remainder of 17.
Record the quotient 5 as the next digit in the result. 
Result so far: 32165.0
If we subtract 100 from 117, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 7:
170 divided by 20 is 8 with a remainder of 10.
Use 8 as the next digit of our solution. 
Result so far: 32165.8
Deduct 160 from 170 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
20 goes into 100 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 32165.85
If we subtract 100 from 100, 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.

Advancing to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 32165.85
If we take 0 away from 0, we end up 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.

Going ahead to step 10:
If we divide 0 by 20, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 32165.85
If we take 0 away from 0, we end up 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.

The final outcome is 32165.85, with a leftover of 0.0.