A:
Positive:
1 x 2540338911 x 230939917 x 149431761 x 416449131 x 193919187 x 135847289 x 87901671 x 378591037 x 244971441 x 176292227 x 114073179 x 7991
Negative:
-1 x -25403389-11 x -2309399-17 x -1494317-61 x -416449-131 x -193919-187 x -135847-289 x -87901-671 x -37859-1037 x -24497-1441 x -17629-2227 x -11407-3179 x -7991
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 25,403,389, 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 | 25,403,389 | |
| -1 | -25,403,389 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,403,389.
Example:
1 x 25,403,389 = 25,403,389
and
-1 x -25,403,389 = 25,403,389
Notice both answers equal 25,403,389
With that explanation out of the way, let's continue. Next, we take the number 25,403,389 and divide it by 2:
25,403,389 ÷ 2 = 12,701,694.5
If the quotient is a whole number, then 2 and 12,701,694.5 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 | 25,403,389 | |
| -1 | -25,403,389 |
Now, we try dividing 25,403,389 by 3:
25,403,389 ÷ 3 = 8,467,796.3333
If the quotient is a whole number, then 3 and 8,467,796.3333 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 | 25,403,389 | |
| -1 | -25,403,389 |
Let's try dividing by 4:
25,403,389 ÷ 4 = 6,350,847.25
If the quotient is a whole number, then 4 and 6,350,847.25 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 | 25,403,389 | |
| -1 | 25,403,389 |
If you did it right, you will end up with this table:
| 1 | 11 | 17 | 61 | 131 | 187 | 289 | 671 | 1,037 | 1,441 | 2,227 | 3,179 | 7,991 | 11,407 | 17,629 | 24,497 | 37,859 | 87,901 | 135,847 | 193,919 | 416,449 | 1,494,317 | 2,309,399 | 25,403,389 |
| -1 | -11 | -17 | -61 | -131 | -187 | -289 | -671 | -1,037 | -1,441 | -2,227 | -3,179 | -7,991 | -11,407 | -17,629 | -24,497 | -37,859 | -87,901 | -135,847 | -193,919 | -416,449 | -1,494,317 | -2,309,399 | -25,403,389 |
Here are some more numbers to try:
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