We look at the division of 542391 by 20 
We're looking to find how many times 20 goes into 542391.

Advancing to step 1:
5 divided by 20 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 20

Step 2:
20 goes into 54 2 times with a remainder of 14.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 40 from 54 leaves us with 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 20

Moving on to step 3:
When dividing 142 by 20, we get 7 with a remainder of 2.
The number 7 becomes the next digit in our result. 
Result so far: 27.0
If we subtract 140 from 142, we get 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 20

Moving on to step 4:
When dividing 23 by 20, we get 1 with a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 271.0
If we subtract 20 from 23, we get 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 20

Step 5:
39 divided by 20 is 1 with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 2711.0
If we take 20 away from 39, we end up with 19.
Append the next digit (1) from the dividend to 19 and continue with: 191 / 20

Let's proceed to step 6:
20 goes into 191 9 times with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 27119.0
Deduct 180 from 191 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 7:
The number 20 fits into 110 5 times, leaving a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 27119.5
The remainder is 10 after subtracting 100 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
The number 20 fits into 100 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 27119.55
Subtracting 100 from 100 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.

Our division results in 27119.55 with a remaining 0.0.