A:
Positive:
1 x 154214155 x 308428331 x 49746537 x 416795155 x 99493185 x 833591147 x 134452689 x 5735
Negative:
-1 x -15421415-5 x -3084283-31 x -497465-37 x -416795-155 x -99493-185 x -83359-1147 x -13445-2689 x -5735
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 15,421,415, 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 | 15,421,415 | |
| -1 | -15,421,415 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,421,415.
Example:
1 x 15,421,415 = 15,421,415
and
-1 x -15,421,415 = 15,421,415
Notice both answers equal 15,421,415
With that explanation out of the way, let's continue. Next, we take the number 15,421,415 and divide it by 2:
15,421,415 ÷ 2 = 7,710,707.5
If the quotient is a whole number, then 2 and 7,710,707.5 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 | 15,421,415 | |
| -1 | -15,421,415 |
Now, we try dividing 15,421,415 by 3:
15,421,415 ÷ 3 = 5,140,471.6667
If the quotient is a whole number, then 3 and 5,140,471.6667 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 | 15,421,415 | |
| -1 | -15,421,415 |
Let's try dividing by 4:
15,421,415 ÷ 4 = 3,855,353.75
If the quotient is a whole number, then 4 and 3,855,353.75 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 | 15,421,415 | |
| -1 | 15,421,415 |
If you did it right, you will end up with this table:
| 1 | 5 | 31 | 37 | 155 | 185 | 1,147 | 2,689 | 5,735 | 13,445 | 83,359 | 99,493 | 416,795 | 497,465 | 3,084,283 | 15,421,415 |
| -1 | -5 | -31 | -37 | -155 | -185 | -1,147 | -2,689 | -5,735 | -13,445 | -83,359 | -99,493 | -416,795 | -497,465 | -3,084,283 | -15,421,415 |
Here are some more numbers to try:
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