A:
Positive:
1 x 211660455 x 423320941 x 516245205 x 103249223 x 94915463 x 457151115 x 189832315 x 9143
Negative:
-1 x -21166045-5 x -4233209-41 x -516245-205 x -103249-223 x -94915-463 x -45715-1115 x -18983-2315 x -9143
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 21,166,045, 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 | 21,166,045 | |
| -1 | -21,166,045 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,166,045.
Example:
1 x 21,166,045 = 21,166,045
and
-1 x -21,166,045 = 21,166,045
Notice both answers equal 21,166,045
With that explanation out of the way, let's continue. Next, we take the number 21,166,045 and divide it by 2:
21,166,045 ÷ 2 = 10,583,022.5
If the quotient is a whole number, then 2 and 10,583,022.5 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 | 21,166,045 | |
| -1 | -21,166,045 |
Now, we try dividing 21,166,045 by 3:
21,166,045 ÷ 3 = 7,055,348.3333
If the quotient is a whole number, then 3 and 7,055,348.3333 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 | 21,166,045 | |
| -1 | -21,166,045 |
Let's try dividing by 4:
21,166,045 ÷ 4 = 5,291,511.25
If the quotient is a whole number, then 4 and 5,291,511.25 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 | 21,166,045 | |
| -1 | 21,166,045 |
If you did it right, you will end up with this table:
| 1 | 5 | 41 | 205 | 223 | 463 | 1,115 | 2,315 | 9,143 | 18,983 | 45,715 | 94,915 | 103,249 | 516,245 | 4,233,209 | 21,166,045 |
| -1 | -5 | -41 | -205 | -223 | -463 | -1,115 | -2,315 | -9,143 | -18,983 | -45,715 | -94,915 | -103,249 | -516,245 | -4,233,209 | -21,166,045 |
Here are some more numbers to try:
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