A:
Positive:
1 x 214405877 x 306294117 x 126121149 x 437563119 x 180173343 x 62509833 x 257393677 x 5831
Negative:
-1 x -21440587-7 x -3062941-17 x -1261211-49 x -437563-119 x -180173-343 x -62509-833 x -25739-3677 x -5831
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 21,440,587, 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 | 21,440,587 | |
| -1 | -21,440,587 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,440,587.
Example:
1 x 21,440,587 = 21,440,587
and
-1 x -21,440,587 = 21,440,587
Notice both answers equal 21,440,587
With that explanation out of the way, let's continue. Next, we take the number 21,440,587 and divide it by 2:
21,440,587 ÷ 2 = 10,720,293.5
If the quotient is a whole number, then 2 and 10,720,293.5 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 | 21,440,587 | |
| -1 | -21,440,587 |
Now, we try dividing 21,440,587 by 3:
21,440,587 ÷ 3 = 7,146,862.3333
If the quotient is a whole number, then 3 and 7,146,862.3333 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 | 21,440,587 | |
| -1 | -21,440,587 |
Let's try dividing by 4:
21,440,587 ÷ 4 = 5,360,146.75
If the quotient is a whole number, then 4 and 5,360,146.75 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 | 21,440,587 | |
| -1 | 21,440,587 |
If you did it right, you will end up with this table:
| 1 | 7 | 17 | 49 | 119 | 343 | 833 | 3,677 | 5,831 | 25,739 | 62,509 | 180,173 | 437,563 | 1,261,211 | 3,062,941 | 21,440,587 |
| -1 | -7 | -17 | -49 | -119 | -343 | -833 | -3,677 | -5,831 | -25,739 | -62,509 | -180,173 | -437,563 | -1,261,211 | -3,062,941 | -21,440,587 |
Here are some more numbers to try:
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