A:
Positive:
1 x 215367055 x 430734117 x 126686529 x 74264585 x 253373145 x 148529493 x 436852465 x 8737
Negative:
-1 x -21536705-5 x -4307341-17 x -1266865-29 x -742645-85 x -253373-145 x -148529-493 x -43685-2465 x -8737
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 21,536,705, 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 | 21,536,705 | |
| -1 | -21,536,705 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,536,705.
Example:
1 x 21,536,705 = 21,536,705
and
-1 x -21,536,705 = 21,536,705
Notice both answers equal 21,536,705
With that explanation out of the way, let's continue. Next, we take the number 21,536,705 and divide it by 2:
21,536,705 ÷ 2 = 10,768,352.5
If the quotient is a whole number, then 2 and 10,768,352.5 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 | 21,536,705 | |
| -1 | -21,536,705 |
Now, we try dividing 21,536,705 by 3:
21,536,705 ÷ 3 = 7,178,901.6667
If the quotient is a whole number, then 3 and 7,178,901.6667 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 | 21,536,705 | |
| -1 | -21,536,705 |
Let's try dividing by 4:
21,536,705 ÷ 4 = 5,384,176.25
If the quotient is a whole number, then 4 and 5,384,176.25 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 | 21,536,705 | |
| -1 | 21,536,705 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 29 | 85 | 145 | 493 | 2,465 | 8,737 | 43,685 | 148,529 | 253,373 | 742,645 | 1,266,865 | 4,307,341 | 21,536,705 |
| -1 | -5 | -17 | -29 | -85 | -145 | -493 | -2,465 | -8,737 | -43,685 | -148,529 | -253,373 | -742,645 | -1,266,865 | -4,307,341 | -21,536,705 |
Here are some more numbers to try:
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