A:
Positive:
1 x 207701455 x 415402911 x 188819555 x 377639101 x 205645505 x 411291111 x 186953739 x 5555
Negative:
-1 x -20770145-5 x -4154029-11 x -1888195-55 x -377639-101 x -205645-505 x -41129-1111 x -18695-3739 x -5555
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 20,770,145, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 20,770,145 | |
| -1 | -20,770,145 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,770,145.
Example:
1 x 20,770,145 = 20,770,145
and
-1 x -20,770,145 = 20,770,145
Notice both answers equal 20,770,145
With that explanation out of the way, let's continue. Next, we take the number 20,770,145 and divide it by 2:
20,770,145 ÷ 2 = 10,385,072.5
If the quotient is a whole number, then 2 and 10,385,072.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 20,770,145 | |
| -1 | -20,770,145 |
Now, we try dividing 20,770,145 by 3:
20,770,145 ÷ 3 = 6,923,381.6667
If the quotient is a whole number, then 3 and 6,923,381.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 20,770,145 | |
| -1 | -20,770,145 |
Let's try dividing by 4:
20,770,145 ÷ 4 = 5,192,536.25
If the quotient is a whole number, then 4 and 5,192,536.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 20,770,145 | |
| -1 | 20,770,145 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 101 | 505 | 1,111 | 3,739 | 5,555 | 18,695 | 41,129 | 205,645 | 377,639 | 1,888,195 | 4,154,029 | 20,770,145 |
| -1 | -5 | -11 | -55 | -101 | -505 | -1,111 | -3,739 | -5,555 | -18,695 | -41,129 | -205,645 | -377,639 | -1,888,195 | -4,154,029 | -20,770,145 |
Here are some more numbers to try:
Try the factor calculator