A:
Positive:
1 x 216070855 x 432141717 x 127100519 x 113721585 x 25420195 x 227443289 x 74765323 x 66895787 x 274551445 x 149531615 x 133793935 x 5491
Negative:
-1 x -21607085-5 x -4321417-17 x -1271005-19 x -1137215-85 x -254201-95 x -227443-289 x -74765-323 x -66895-787 x -27455-1445 x -14953-1615 x -13379-3935 x -5491
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 21,607,085, 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 | 21,607,085 | |
| -1 | -21,607,085 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,607,085.
Example:
1 x 21,607,085 = 21,607,085
and
-1 x -21,607,085 = 21,607,085
Notice both answers equal 21,607,085
With that explanation out of the way, let's continue. Next, we take the number 21,607,085 and divide it by 2:
21,607,085 ÷ 2 = 10,803,542.5
If the quotient is a whole number, then 2 and 10,803,542.5 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 | 21,607,085 | |
| -1 | -21,607,085 |
Now, we try dividing 21,607,085 by 3:
21,607,085 ÷ 3 = 7,202,361.6667
If the quotient is a whole number, then 3 and 7,202,361.6667 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 | 21,607,085 | |
| -1 | -21,607,085 |
Let's try dividing by 4:
21,607,085 ÷ 4 = 5,401,771.25
If the quotient is a whole number, then 4 and 5,401,771.25 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 | 21,607,085 | |
| -1 | 21,607,085 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 19 | 85 | 95 | 289 | 323 | 787 | 1,445 | 1,615 | 3,935 | 5,491 | 13,379 | 14,953 | 27,455 | 66,895 | 74,765 | 227,443 | 254,201 | 1,137,215 | 1,271,005 | 4,321,417 | 21,607,085 |
| -1 | -5 | -17 | -19 | -85 | -95 | -289 | -323 | -787 | -1,445 | -1,615 | -3,935 | -5,491 | -13,379 | -14,953 | -27,455 | -66,895 | -74,765 | -227,443 | -254,201 | -1,137,215 | -1,271,005 | -4,321,417 | -21,607,085 |
Here are some more numbers to try:
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