A:
Positive:
1 x 156039855 x 312079741 x 380585103 x 151495205 x 76117515 x 30299739 x 211153695 x 4223
Negative:
-1 x -15603985-5 x -3120797-41 x -380585-103 x -151495-205 x -76117-515 x -30299-739 x -21115-3695 x -4223
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 15,603,985, 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 | 15,603,985 | |
| -1 | -15,603,985 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,603,985.
Example:
1 x 15,603,985 = 15,603,985
and
-1 x -15,603,985 = 15,603,985
Notice both answers equal 15,603,985
With that explanation out of the way, let's continue. Next, we take the number 15,603,985 and divide it by 2:
15,603,985 ÷ 2 = 7,801,992.5
If the quotient is a whole number, then 2 and 7,801,992.5 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 | 15,603,985 | |
| -1 | -15,603,985 |
Now, we try dividing 15,603,985 by 3:
15,603,985 ÷ 3 = 5,201,328.3333
If the quotient is a whole number, then 3 and 5,201,328.3333 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 | 15,603,985 | |
| -1 | -15,603,985 |
Let's try dividing by 4:
15,603,985 ÷ 4 = 3,900,996.25
If the quotient is a whole number, then 4 and 3,900,996.25 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 | 15,603,985 | |
| -1 | 15,603,985 |
If you did it right, you will end up with this table:
| 1 | 5 | 41 | 103 | 205 | 515 | 739 | 3,695 | 4,223 | 21,115 | 30,299 | 76,117 | 151,495 | 380,585 | 3,120,797 | 15,603,985 |
| -1 | -5 | -41 | -103 | -205 | -515 | -739 | -3,695 | -4,223 | -21,115 | -30,299 | -76,117 | -151,495 | -380,585 | -3,120,797 | -15,603,985 |
Here are some more numbers to try:
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