A:
Positive:
1 x 218683555 x 437367171 x 308005229 x 95495269 x 81295355 x 616011145 x 190991345 x 16259
Negative:
-1 x -21868355-5 x -4373671-71 x -308005-229 x -95495-269 x -81295-355 x -61601-1145 x -19099-1345 x -16259
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 21,868,355, 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 | 21,868,355 | |
| -1 | -21,868,355 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,868,355.
Example:
1 x 21,868,355 = 21,868,355
and
-1 x -21,868,355 = 21,868,355
Notice both answers equal 21,868,355
With that explanation out of the way, let's continue. Next, we take the number 21,868,355 and divide it by 2:
21,868,355 ÷ 2 = 10,934,177.5
If the quotient is a whole number, then 2 and 10,934,177.5 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 | 21,868,355 | |
| -1 | -21,868,355 |
Now, we try dividing 21,868,355 by 3:
21,868,355 ÷ 3 = 7,289,451.6667
If the quotient is a whole number, then 3 and 7,289,451.6667 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 | 21,868,355 | |
| -1 | -21,868,355 |
Let's try dividing by 4:
21,868,355 ÷ 4 = 5,467,088.75
If the quotient is a whole number, then 4 and 5,467,088.75 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 | 21,868,355 | |
| -1 | 21,868,355 |
If you did it right, you will end up with this table:
| 1 | 5 | 71 | 229 | 269 | 355 | 1,145 | 1,345 | 16,259 | 19,099 | 61,601 | 81,295 | 95,495 | 308,005 | 4,373,671 | 21,868,355 |
| -1 | -5 | -71 | -229 | -269 | -355 | -1,145 | -1,345 | -16,259 | -19,099 | -61,601 | -81,295 | -95,495 | -308,005 | -4,373,671 | -21,868,355 |
Here are some more numbers to try:
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