We divide 777980 by 20
We want to figure out the number of times 777980 can be divided by 20.

Step 1:
20 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 20

On to step 2:
20 goes into 77 3 times with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 60 from 77 leaves us with 17.
Bring next digit (7) of the dividend behind the 17 and repeat the process: 177 / 20

Going ahead to step 3:
20 can be fit into 177 8 times, resulting in a remainder of 17.
Write down 8 as next digit of the result. 
Result so far: 38.0
The remainder is 17 after subtracting 160 from 177.
Take the next digit (9) from the dividend and append it to 17, then repeat: 179 / 20

Let's proceed to step 4:
20 goes into 179 8 times with a remainder of 19.
The number 8 becomes the next digit in our result. 
Result so far: 388.0
If we subtract 160 from 179, we get 19.
Append the next digit (8) from the dividend to 19 and continue with: 198 / 20

Step 5:
When dividing 198 by 20, we get 9 with a remainder of 18.
The number 9 becomes the next digit in our result. 
Result so far: 3889.0
Deduct 180 from 198 and we're left with 18.
Bring next digit (0) of the dividend behind the 18 and repeat the process: 180 / 20

Going ahead to step 6:
20 goes into 180 9 times with a remainder of 0.
The next digit of our result is 9. 
Result so far: 38899.0
Subtract 180 from 180 to 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.

Step 7:
20 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 38899.0
Subtract 0 from 0 to 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.

Going ahead to step 8:
0 divided by 20 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 38899.0
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 38899.0, with a leftover of 0.0.