A:
Positive:
1 x 211664055 x 423328113 x 162818537 x 57206565 x 325637169 x 125245185 x 114413481 x 44005677 x 31265845 x 250492405 x 88013385 x 6253
Negative:
-1 x -21166405-5 x -4233281-13 x -1628185-37 x -572065-65 x -325637-169 x -125245-185 x -114413-481 x -44005-677 x -31265-845 x -25049-2405 x -8801-3385 x -6253
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 21,166,405, 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 | 21,166,405 | |
| -1 | -21,166,405 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,166,405.
Example:
1 x 21,166,405 = 21,166,405
and
-1 x -21,166,405 = 21,166,405
Notice both answers equal 21,166,405
With that explanation out of the way, let's continue. Next, we take the number 21,166,405 and divide it by 2:
21,166,405 ÷ 2 = 10,583,202.5
If the quotient is a whole number, then 2 and 10,583,202.5 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 | 21,166,405 | |
| -1 | -21,166,405 |
Now, we try dividing 21,166,405 by 3:
21,166,405 ÷ 3 = 7,055,468.3333
If the quotient is a whole number, then 3 and 7,055,468.3333 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 | 21,166,405 | |
| -1 | -21,166,405 |
Let's try dividing by 4:
21,166,405 ÷ 4 = 5,291,601.25
If the quotient is a whole number, then 4 and 5,291,601.25 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 | 21,166,405 | |
| -1 | 21,166,405 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 37 | 65 | 169 | 185 | 481 | 677 | 845 | 2,405 | 3,385 | 6,253 | 8,801 | 25,049 | 31,265 | 44,005 | 114,413 | 125,245 | 325,637 | 572,065 | 1,628,185 | 4,233,281 | 21,166,405 |
| -1 | -5 | -13 | -37 | -65 | -169 | -185 | -481 | -677 | -845 | -2,405 | -3,385 | -6,253 | -8,801 | -25,049 | -31,265 | -44,005 | -114,413 | -125,245 | -325,637 | -572,065 | -1,628,185 | -4,233,281 | -21,166,405 |
Here are some more numbers to try:
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