A:
Positive:
1 x 21507437 x 30724919 x 113197103 x 20881133 x 16171157 x 13699721 x 29831099 x 1957
Negative:
-1 x -2150743-7 x -307249-19 x -113197-103 x -20881-133 x -16171-157 x -13699-721 x -2983-1099 x -1957
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 2,150,743, 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 | 2,150,743 | |
| -1 | -2,150,743 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 2,150,743.
Example:
1 x 2,150,743 = 2,150,743
and
-1 x -2,150,743 = 2,150,743
Notice both answers equal 2,150,743
With that explanation out of the way, let's continue. Next, we take the number 2,150,743 and divide it by 2:
2,150,743 ÷ 2 = 1,075,371.5
If the quotient is a whole number, then 2 and 1,075,371.5 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 | 2,150,743 | |
| -1 | -2,150,743 |
Now, we try dividing 2,150,743 by 3:
2,150,743 ÷ 3 = 716,914.3333
If the quotient is a whole number, then 3 and 716,914.3333 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 | 2,150,743 | |
| -1 | -2,150,743 |
Let's try dividing by 4:
2,150,743 ÷ 4 = 537,685.75
If the quotient is a whole number, then 4 and 537,685.75 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 | 2,150,743 | |
| -1 | 2,150,743 |
If you did it right, you will end up with this table:
| 1 | 7 | 19 | 103 | 133 | 157 | 721 | 1,099 | 1,957 | 2,983 | 13,699 | 16,171 | 20,881 | 113,197 | 307,249 | 2,150,743 |
| -1 | -7 | -19 | -103 | -133 | -157 | -721 | -1,099 | -1,957 | -2,983 | -13,699 | -16,171 | -20,881 | -113,197 | -307,249 | -2,150,743 |
Here are some more numbers to try:
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