We look at the division of 336638 by 20 
Let's see how many times 20 fits into 336638.

Let's proceed to step 1:
20 goes into 3 0 times with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 20

On to step 2:
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: 1.0
Deduct 20 from 33 and we're left with 13.
Grab the next digit (6) from the dividend, add it to 13, then carry on: 136 / 20

Advancing to step 3:
If we divide 136 by 20, we get 6 and a remainder of 16.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Subtract 120 from 136 to get 16.
Include the next digit (6) from the dividend after 16, then repeat: 166 / 20

On to step 4:
If we divide 166 by 20, we get 8 and a remainder of 6.
The next digit of our result is 8. 
Result so far: 168.0
If we take 160 away from 166, we end up with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 20

On to step 5:
If we divide 63 by 20, we get 3 and a remainder of 3.
The next digit of our result is 3. 
Result so far: 1683.0
The remainder is 3 after subtracting 60 from 63.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 20

Step 6:
The number 20 fits into 38 1 times, leaving a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 16831.0
Deduct 20 from 38 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 7:
180 divided by 20 is 9 with a remainder of 0.
The next digit of our result is 9. 
Result so far: 16831.9
If we take 180 away from 180, 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.

Advancing to step 8:
0 divided by 20 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 16831.9
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.

Advancing to step 9:
0 divided by 20 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 16831.9
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 result is 16831.9 with a remainder of 0.0.