A:
Positive:
1 x 214178455 x 428356919 x 112725595 x 225451131 x 163495655 x 326991721 x 124452489 x 8605
Negative:
-1 x -21417845-5 x -4283569-19 x -1127255-95 x -225451-131 x -163495-655 x -32699-1721 x -12445-2489 x -8605
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 21,417,845, 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 | 21,417,845 | |
| -1 | -21,417,845 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,417,845.
Example:
1 x 21,417,845 = 21,417,845
and
-1 x -21,417,845 = 21,417,845
Notice both answers equal 21,417,845
With that explanation out of the way, let's continue. Next, we take the number 21,417,845 and divide it by 2:
21,417,845 ÷ 2 = 10,708,922.5
If the quotient is a whole number, then 2 and 10,708,922.5 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 | 21,417,845 | |
| -1 | -21,417,845 |
Now, we try dividing 21,417,845 by 3:
21,417,845 ÷ 3 = 7,139,281.6667
If the quotient is a whole number, then 3 and 7,139,281.6667 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 | 21,417,845 | |
| -1 | -21,417,845 |
Let's try dividing by 4:
21,417,845 ÷ 4 = 5,354,461.25
If the quotient is a whole number, then 4 and 5,354,461.25 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 | 21,417,845 | |
| -1 | 21,417,845 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 95 | 131 | 655 | 1,721 | 2,489 | 8,605 | 12,445 | 32,699 | 163,495 | 225,451 | 1,127,255 | 4,283,569 | 21,417,845 |
| -1 | -5 | -19 | -95 | -131 | -655 | -1,721 | -2,489 | -8,605 | -12,445 | -32,699 | -163,495 | -225,451 | -1,127,255 | -4,283,569 | -21,417,845 |
Here are some more numbers to try:
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