A:
Positive:
1 x 212477455 x 424954923 x 92381573 x 291065115 x 184763365 x 582131679 x 126552531 x 8395
Negative:
-1 x -21247745-5 x -4249549-23 x -923815-73 x -291065-115 x -184763-365 x -58213-1679 x -12655-2531 x -8395
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 21,247,745, 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 | 21,247,745 | |
| -1 | -21,247,745 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,247,745.
Example:
1 x 21,247,745 = 21,247,745
and
-1 x -21,247,745 = 21,247,745
Notice both answers equal 21,247,745
With that explanation out of the way, let's continue. Next, we take the number 21,247,745 and divide it by 2:
21,247,745 ÷ 2 = 10,623,872.5
If the quotient is a whole number, then 2 and 10,623,872.5 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 | 21,247,745 | |
| -1 | -21,247,745 |
Now, we try dividing 21,247,745 by 3:
21,247,745 ÷ 3 = 7,082,581.6667
If the quotient is a whole number, then 3 and 7,082,581.6667 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 | 21,247,745 | |
| -1 | -21,247,745 |
Let's try dividing by 4:
21,247,745 ÷ 4 = 5,311,936.25
If the quotient is a whole number, then 4 and 5,311,936.25 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 | 21,247,745 | |
| -1 | 21,247,745 |
If you did it right, you will end up with this table:
| 1 | 5 | 23 | 73 | 115 | 365 | 1,679 | 2,531 | 8,395 | 12,655 | 58,213 | 184,763 | 291,065 | 923,815 | 4,249,549 | 21,247,745 |
| -1 | -5 | -23 | -73 | -115 | -365 | -1,679 | -2,531 | -8,395 | -12,655 | -58,213 | -184,763 | -291,065 | -923,815 | -4,249,549 | -21,247,745 |
Here are some more numbers to try:
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