A:
Positive:
1 x 157805837 x 225436913 x 121389119 x 83055791 x 173413133 x 118651247 x 638891729 x 9127
Negative:
-1 x -15780583-7 x -2254369-13 x -1213891-19 x -830557-91 x -173413-133 x -118651-247 x -63889-1729 x -9127
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 15,780,583, 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 | 15,780,583 | |
| -1 | -15,780,583 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,780,583.
Example:
1 x 15,780,583 = 15,780,583
and
-1 x -15,780,583 = 15,780,583
Notice both answers equal 15,780,583
With that explanation out of the way, let's continue. Next, we take the number 15,780,583 and divide it by 2:
15,780,583 ÷ 2 = 7,890,291.5
If the quotient is a whole number, then 2 and 7,890,291.5 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 | 15,780,583 | |
| -1 | -15,780,583 |
Now, we try dividing 15,780,583 by 3:
15,780,583 ÷ 3 = 5,260,194.3333
If the quotient is a whole number, then 3 and 5,260,194.3333 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 | 15,780,583 | |
| -1 | -15,780,583 |
Let's try dividing by 4:
15,780,583 ÷ 4 = 3,945,145.75
If the quotient is a whole number, then 4 and 3,945,145.75 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 | 15,780,583 | |
| -1 | 15,780,583 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 19 | 91 | 133 | 247 | 1,729 | 9,127 | 63,889 | 118,651 | 173,413 | 830,557 | 1,213,891 | 2,254,369 | 15,780,583 |
| -1 | -7 | -13 | -19 | -91 | -133 | -247 | -1,729 | -9,127 | -63,889 | -118,651 | -173,413 | -830,557 | -1,213,891 | -2,254,369 | -15,780,583 |
Here are some more numbers to try:
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