A:
Positive:
1 x 158201455 x 316402911 x 143819555 x 28763979 x 200255121 x 130745331 x 47795395 x 40051605 x 26149869 x 182051655 x 95593641 x 4345
Negative:
-1 x -15820145-5 x -3164029-11 x -1438195-55 x -287639-79 x -200255-121 x -130745-331 x -47795-395 x -40051-605 x -26149-869 x -18205-1655 x -9559-3641 x -4345
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 15,820,145, 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 | 15,820,145 | |
| -1 | -15,820,145 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,820,145.
Example:
1 x 15,820,145 = 15,820,145
and
-1 x -15,820,145 = 15,820,145
Notice both answers equal 15,820,145
With that explanation out of the way, let's continue. Next, we take the number 15,820,145 and divide it by 2:
15,820,145 ÷ 2 = 7,910,072.5
If the quotient is a whole number, then 2 and 7,910,072.5 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 | 15,820,145 | |
| -1 | -15,820,145 |
Now, we try dividing 15,820,145 by 3:
15,820,145 ÷ 3 = 5,273,381.6667
If the quotient is a whole number, then 3 and 5,273,381.6667 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 | 15,820,145 | |
| -1 | -15,820,145 |
Let's try dividing by 4:
15,820,145 ÷ 4 = 3,955,036.25
If the quotient is a whole number, then 4 and 3,955,036.25 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 | 15,820,145 | |
| -1 | 15,820,145 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 79 | 121 | 331 | 395 | 605 | 869 | 1,655 | 3,641 | 4,345 | 9,559 | 18,205 | 26,149 | 40,051 | 47,795 | 130,745 | 200,255 | 287,639 | 1,438,195 | 3,164,029 | 15,820,145 |
| -1 | -5 | -11 | -55 | -79 | -121 | -331 | -395 | -605 | -869 | -1,655 | -3,641 | -4,345 | -9,559 | -18,205 | -26,149 | -40,051 | -47,795 | -130,745 | -200,255 | -287,639 | -1,438,195 | -3,164,029 | -15,820,145 |
Here are some more numbers to try:
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