A:
Positive:
1 x 257802055 x 515604111 x 234365547 x 54851555 x 468731235 x 109703517 x 498652585 x 9973
Negative:
-1 x -25780205-5 x -5156041-11 x -2343655-47 x -548515-55 x -468731-235 x -109703-517 x -49865-2585 x -9973
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 25,780,205, 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 | 25,780,205 | |
| -1 | -25,780,205 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,780,205.
Example:
1 x 25,780,205 = 25,780,205
and
-1 x -25,780,205 = 25,780,205
Notice both answers equal 25,780,205
With that explanation out of the way, let's continue. Next, we take the number 25,780,205 and divide it by 2:
25,780,205 ÷ 2 = 12,890,102.5
If the quotient is a whole number, then 2 and 12,890,102.5 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 | 25,780,205 | |
| -1 | -25,780,205 |
Now, we try dividing 25,780,205 by 3:
25,780,205 ÷ 3 = 8,593,401.6667
If the quotient is a whole number, then 3 and 8,593,401.6667 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 | 25,780,205 | |
| -1 | -25,780,205 |
Let's try dividing by 4:
25,780,205 ÷ 4 = 6,445,051.25
If the quotient is a whole number, then 4 and 6,445,051.25 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 | 25,780,205 | |
| -1 | 25,780,205 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 47 | 55 | 235 | 517 | 2,585 | 9,973 | 49,865 | 109,703 | 468,731 | 548,515 | 2,343,655 | 5,156,041 | 25,780,205 |
| -1 | -5 | -11 | -47 | -55 | -235 | -517 | -2,585 | -9,973 | -49,865 | -109,703 | -468,731 | -548,515 | -2,343,655 | -5,156,041 | -25,780,205 |
Here are some more numbers to try:
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