243916 ÷ 20 
Let's see how many times 20 fits into 243916.

Step 1:
If we divide 2 by 20, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (4) from the dividend, add it to 2, then carry on: 24 / 20

Moving on to step 2:
24 divided by 20 is 1 with a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 20 from 24 leaves us with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 20

Moving on to step 3:
43 divided by 20 is 2 with a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 12.0
The remainder is 3 after subtracting 40 from 43.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 20

Step 4:
The number 20 fits into 39 1 times, leaving a remainder of 19.
The next digit of our result is 1. 
Result so far: 121.0
The remainder is 19 after subtracting 20 from 39.
Bring next digit (1) of the dividend behind the 19 and repeat the process: 191 / 20

Moving on to step 5:
20 goes into 191 9 times with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 1219.0
Subtract 180 from 191 to get 11.
Take the next digit (6) from the dividend and append it to 11, then repeat: 116 / 20

On to step 6:
20 can be fit into 116 5 times, resulting in a remainder of 16.
The number 5 becomes the next digit in our result. 
Result so far: 12195.0
Subtracting 100 from 116 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 7:
20 can be fit into 160 8 times, resulting in a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 12195.8
The remainder is 0 after subtracting 160 from 160.
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:
When dividing 0 by 20, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 12195.8
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 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: 12195.8
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 12195.8, with a leftover of 0.0.