A:
Positive:
1 x 216601555 x 433203111 x 196910555 x 393821199 x 108845995 x 217691979 x 109452189 x 9895
Negative:
-1 x -21660155-5 x -4332031-11 x -1969105-55 x -393821-199 x -108845-995 x -21769-1979 x -10945-2189 x -9895
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 21,660,155, 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 | 21,660,155 | |
| -1 | -21,660,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,660,155.
Example:
1 x 21,660,155 = 21,660,155
and
-1 x -21,660,155 = 21,660,155
Notice both answers equal 21,660,155
With that explanation out of the way, let's continue. Next, we take the number 21,660,155 and divide it by 2:
21,660,155 ÷ 2 = 10,830,077.5
If the quotient is a whole number, then 2 and 10,830,077.5 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 | 21,660,155 | |
| -1 | -21,660,155 |
Now, we try dividing 21,660,155 by 3:
21,660,155 ÷ 3 = 7,220,051.6667
If the quotient is a whole number, then 3 and 7,220,051.6667 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 | 21,660,155 | |
| -1 | -21,660,155 |
Let's try dividing by 4:
21,660,155 ÷ 4 = 5,415,038.75
If the quotient is a whole number, then 4 and 5,415,038.75 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 | 21,660,155 | |
| -1 | 21,660,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 199 | 995 | 1,979 | 2,189 | 9,895 | 10,945 | 21,769 | 108,845 | 393,821 | 1,969,105 | 4,332,031 | 21,660,155 |
| -1 | -5 | -11 | -55 | -199 | -995 | -1,979 | -2,189 | -9,895 | -10,945 | -21,769 | -108,845 | -393,821 | -1,969,105 | -4,332,031 | -21,660,155 |
Here are some more numbers to try:
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