A:
Positive:
1 x 20213055 x 40426111 x 18375513 x 15548555 x 3675165 x 31097121 x 16705143 x 14135257 x 7865605 x 3341715 x 28271285 x 1573
Negative:
-1 x -2021305-5 x -404261-11 x -183755-13 x -155485-55 x -36751-65 x -31097-121 x -16705-143 x -14135-257 x -7865-605 x -3341-715 x -2827-1285 x -1573
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 2,021,305, 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 | 2,021,305 | |
| -1 | -2,021,305 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 2,021,305.
Example:
1 x 2,021,305 = 2,021,305
and
-1 x -2,021,305 = 2,021,305
Notice both answers equal 2,021,305
With that explanation out of the way, let's continue. Next, we take the number 2,021,305 and divide it by 2:
2,021,305 ÷ 2 = 1,010,652.5
If the quotient is a whole number, then 2 and 1,010,652.5 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 | 2,021,305 | |
| -1 | -2,021,305 |
Now, we try dividing 2,021,305 by 3:
2,021,305 ÷ 3 = 673,768.3333
If the quotient is a whole number, then 3 and 673,768.3333 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 | 2,021,305 | |
| -1 | -2,021,305 |
Let's try dividing by 4:
2,021,305 ÷ 4 = 505,326.25
If the quotient is a whole number, then 4 and 505,326.25 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 | 2,021,305 | |
| -1 | 2,021,305 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 13 | 55 | 65 | 121 | 143 | 257 | 605 | 715 | 1,285 | 1,573 | 2,827 | 3,341 | 7,865 | 14,135 | 16,705 | 31,097 | 36,751 | 155,485 | 183,755 | 404,261 | 2,021,305 |
| -1 | -5 | -11 | -13 | -55 | -65 | -121 | -143 | -257 | -605 | -715 | -1,285 | -1,573 | -2,827 | -3,341 | -7,865 | -14,135 | -16,705 | -31,097 | -36,751 | -155,485 | -183,755 | -404,261 | -2,021,305 |
Here are some more numbers to try:
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