A:
Positive:
1 x 150189137 x 214555913 x 115530191 x 165043151 x 994631057 x 142091093 x 137411963 x 7651
Negative:
-1 x -15018913-7 x -2145559-13 x -1155301-91 x -165043-151 x -99463-1057 x -14209-1093 x -13741-1963 x -7651
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 15,018,913, 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 | 15,018,913 | |
| -1 | -15,018,913 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,018,913.
Example:
1 x 15,018,913 = 15,018,913
and
-1 x -15,018,913 = 15,018,913
Notice both answers equal 15,018,913
With that explanation out of the way, let's continue. Next, we take the number 15,018,913 and divide it by 2:
15,018,913 ÷ 2 = 7,509,456.5
If the quotient is a whole number, then 2 and 7,509,456.5 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 | 15,018,913 | |
| -1 | -15,018,913 |
Now, we try dividing 15,018,913 by 3:
15,018,913 ÷ 3 = 5,006,304.3333
If the quotient is a whole number, then 3 and 5,006,304.3333 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 | 15,018,913 | |
| -1 | -15,018,913 |
Let's try dividing by 4:
15,018,913 ÷ 4 = 3,754,728.25
If the quotient is a whole number, then 4 and 3,754,728.25 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 | 15,018,913 | |
| -1 | 15,018,913 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 151 | 1,057 | 1,093 | 1,963 | 7,651 | 13,741 | 14,209 | 99,463 | 165,043 | 1,155,301 | 2,145,559 | 15,018,913 |
| -1 | -7 | -13 | -91 | -151 | -1,057 | -1,093 | -1,963 | -7,651 | -13,741 | -14,209 | -99,463 | -165,043 | -1,155,301 | -2,145,559 | -15,018,913 |
Here are some more numbers to try:
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