A:
Positive:
1 x 130404055 x 26080817 x 186291535 x 372583229 x 569451145 x 113891603 x 81351627 x 8015
Negative:
-1 x -13040405-5 x -2608081-7 x -1862915-35 x -372583-229 x -56945-1145 x -11389-1603 x -8135-1627 x -8015
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 13,040,405, 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 | 13,040,405 | |
| -1 | -13,040,405 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 13,040,405.
Example:
1 x 13,040,405 = 13,040,405
and
-1 x -13,040,405 = 13,040,405
Notice both answers equal 13,040,405
With that explanation out of the way, let's continue. Next, we take the number 13,040,405 and divide it by 2:
13,040,405 ÷ 2 = 6,520,202.5
If the quotient is a whole number, then 2 and 6,520,202.5 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 | 13,040,405 | |
| -1 | -13,040,405 |
Now, we try dividing 13,040,405 by 3:
13,040,405 ÷ 3 = 4,346,801.6667
If the quotient is a whole number, then 3 and 4,346,801.6667 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 | 13,040,405 | |
| -1 | -13,040,405 |
Let's try dividing by 4:
13,040,405 ÷ 4 = 3,260,101.25
If the quotient is a whole number, then 4 and 3,260,101.25 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 | 13,040,405 | |
| -1 | 13,040,405 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 229 | 1,145 | 1,603 | 1,627 | 8,015 | 8,135 | 11,389 | 56,945 | 372,583 | 1,862,915 | 2,608,081 | 13,040,405 |
| -1 | -5 | -7 | -35 | -229 | -1,145 | -1,603 | -1,627 | -8,015 | -8,135 | -11,389 | -56,945 | -372,583 | -1,862,915 | -2,608,081 | -13,040,405 |
Here are some more numbers to try:
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