A:
Positive:
1 x 181285255 x 362570525 x 72514167 x 27057579 x 229475137 x 132325335 x 54115395 x 45895685 x 264651675 x 108231975 x 91793425 x 5293
Negative:
-1 x -18128525-5 x -3625705-25 x -725141-67 x -270575-79 x -229475-137 x -132325-335 x -54115-395 x -45895-685 x -26465-1675 x -10823-1975 x -9179-3425 x -5293
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 18,128,525, 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 | 18,128,525 | |
| -1 | -18,128,525 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 18,128,525.
Example:
1 x 18,128,525 = 18,128,525
and
-1 x -18,128,525 = 18,128,525
Notice both answers equal 18,128,525
With that explanation out of the way, let's continue. Next, we take the number 18,128,525 and divide it by 2:
18,128,525 ÷ 2 = 9,064,262.5
If the quotient is a whole number, then 2 and 9,064,262.5 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 | 18,128,525 | |
| -1 | -18,128,525 |
Now, we try dividing 18,128,525 by 3:
18,128,525 ÷ 3 = 6,042,841.6667
If the quotient is a whole number, then 3 and 6,042,841.6667 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 | 18,128,525 | |
| -1 | -18,128,525 |
Let's try dividing by 4:
18,128,525 ÷ 4 = 4,532,131.25
If the quotient is a whole number, then 4 and 4,532,131.25 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 | 18,128,525 | |
| -1 | 18,128,525 |
If you did it right, you will end up with this table:
| 1 | 5 | 25 | 67 | 79 | 137 | 335 | 395 | 685 | 1,675 | 1,975 | 3,425 | 5,293 | 9,179 | 10,823 | 26,465 | 45,895 | 54,115 | 132,325 | 229,475 | 270,575 | 725,141 | 3,625,705 | 18,128,525 |
| -1 | -5 | -25 | -67 | -79 | -137 | -335 | -395 | -685 | -1,675 | -1,975 | -3,425 | -5,293 | -9,179 | -10,823 | -26,465 | -45,895 | -54,115 | -132,325 | -229,475 | -270,575 | -725,141 | -3,625,705 | -18,128,525 |
Here are some more numbers to try:
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