66994879 divided by 20 
Our goal is to divide 66994879 by 20.

Moving on to step 1:
20 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 20

Going ahead to step 2:
20 can be fit into 66 3 times, resulting in a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 3.0
Deduct 60 from 66 and we're left with 6.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 20

Step 3:
If we divide 69 by 20, we get 3 and a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 33.0
The remainder is 9 after subtracting 60 from 69.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 20

Going ahead to step 4:
20 goes into 99 4 times with a remainder of 19.
Write down 4 as next digit of the result. 
Result so far: 334.0
The remainder is 19 after subtracting 80 from 99.
Grab the next digit (4) from the dividend, add it to 19, then carry on: 194 / 20

On to step 5:
20 can be fit into 194 9 times, resulting in a remainder of 14.
Record the quotient 9 as the next digit in the result. 
Result so far: 3349.0
Deduct 180 from 194 and we're left with 14.
Fetch the next digit (8) from the dividend, attach it to 14 and continue: 148 / 20

Step 6:
20 can be fit into 148 7 times, resulting in a remainder of 8.
The next digit of our result is 7. 
Result so far: 33497.0
If we subtract 140 from 148, we get 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 20

On to step 7:
The number 20 fits into 87 4 times, leaving a remainder of 7.
Put 4 as the next digit of the answer. 
Result so far: 334974.0
Subtracting 80 from 87 leaves us with 7.
Grab the next digit (9) from the dividend, add it to 7, then carry on: 79 / 20

On to step 8:
20 goes into 79 3 times with a remainder of 19.
Record the quotient 3 as the next digit in the result. 
Result so far: 3349743.0
If we subtract 60 from 79, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 9:
20 can be fit into 190 9 times, resulting in a remainder of 10.
The next digit of our result is 9. 
Result so far: 3349743.9
Subtract 180 from 190 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 10:
If we divide 100 by 20, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 3349743.95
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.

Moving on to step 11:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 3349743.95
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 12:
0 divided by 20 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 3349743.95
If we subtract 0 from 0, 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.

The final outcome is 3349743.95, with a leftover of 0.0.