We divide 309544 by 20
Let's see how many times 20 fits into 309544.

Advancing to step 1:
The number 20 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 20

Going ahead to step 2:
If we divide 30 by 20, we get 1 and a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 20 from 30 to get 10.
Include the next digit (9) from the dividend after 10, then repeat: 109 / 20

Step 3:
109 divided by 20 is 5 with a remainder of 9.
Put 5 as the next digit of the answer. 
Result so far: 15.0
If we subtract 100 from 109, we get 9.
Take the next digit (5) from the dividend and append it to 9, then repeat: 95 / 20

On to step 4:
The number 20 fits into 95 4 times, leaving a remainder of 15.
The next digit of our result is 4. 
Result so far: 154.0
If we take 80 away from 95, we end up with 15.
Grab the next digit (4) from the dividend, add it to 15, then carry on: 154 / 20

Going ahead to step 5:
If we divide 154 by 20, we get 7 and a remainder of 14.
Use 7 as the next digit of our solution. 
Result so far: 1547.0
If we take 140 away from 154, we end up with 14.
Take the next digit (4) from the dividend and append it to 14, then repeat: 144 / 20

On to step 6:
20 can be fit into 144 7 times, resulting in a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 15477.0
If we take 140 away from 144, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 7:
40 divided by 20 is 2 with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 15477.2
Deduct 40 from 40 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.

Going ahead to step 8:
If we divide 0 by 20, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 15477.2
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.

Let's proceed to step 9:
20 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 15477.2
Subtracting 0 from 0 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.

After the division, we end up with 15477.2 and a remainder of 0.0.