A:
Positive:
1 x 19802755 x 39605511 x 18002519 x 10422525 x 7921155 x 3600595 x 20845209 x 9475275 x 7201379 x 5225475 x 41691045 x 1895
Negative:
-1 x -1980275-5 x -396055-11 x -180025-19 x -104225-25 x -79211-55 x -36005-95 x -20845-209 x -9475-275 x -7201-379 x -5225-475 x -4169-1045 x -1895
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 1,980,275, 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 | 1,980,275 | |
| -1 | -1,980,275 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 1,980,275.
Example:
1 x 1,980,275 = 1,980,275
and
-1 x -1,980,275 = 1,980,275
Notice both answers equal 1,980,275
With that explanation out of the way, let's continue. Next, we take the number 1,980,275 and divide it by 2:
1,980,275 ÷ 2 = 990,137.5
If the quotient is a whole number, then 2 and 990,137.5 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 | 1,980,275 | |
| -1 | -1,980,275 |
Now, we try dividing 1,980,275 by 3:
1,980,275 ÷ 3 = 660,091.6667
If the quotient is a whole number, then 3 and 660,091.6667 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 | 1,980,275 | |
| -1 | -1,980,275 |
Let's try dividing by 4:
1,980,275 ÷ 4 = 495,068.75
If the quotient is a whole number, then 4 and 495,068.75 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 | 1,980,275 | |
| -1 | 1,980,275 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 19 | 25 | 55 | 95 | 209 | 275 | 379 | 475 | 1,045 | 1,895 | 4,169 | 5,225 | 7,201 | 9,475 | 20,845 | 36,005 | 79,211 | 104,225 | 180,025 | 396,055 | 1,980,275 |
| -1 | -5 | -11 | -19 | -25 | -55 | -95 | -209 | -275 | -379 | -475 | -1,045 | -1,895 | -4,169 | -5,225 | -7,201 | -9,475 | -20,845 | -36,005 | -79,211 | -104,225 | -180,025 | -396,055 | -1,980,275 |
Here are some more numbers to try:
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