A:
Positive:
1 x 2007055713 x 154388917 x 1180621197 x 101881221 x 90817461 x 435372561 x 78373349 x 5993
Negative:
-1 x -20070557-13 x -1543889-17 x -1180621-197 x -101881-221 x -90817-461 x -43537-2561 x -7837-3349 x -5993
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 20,070,557, 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 | 20,070,557 | |
| -1 | -20,070,557 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,070,557.
Example:
1 x 20,070,557 = 20,070,557
and
-1 x -20,070,557 = 20,070,557
Notice both answers equal 20,070,557
With that explanation out of the way, let's continue. Next, we take the number 20,070,557 and divide it by 2:
20,070,557 ÷ 2 = 10,035,278.5
If the quotient is a whole number, then 2 and 10,035,278.5 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 | 20,070,557 | |
| -1 | -20,070,557 |
Now, we try dividing 20,070,557 by 3:
20,070,557 ÷ 3 = 6,690,185.6667
If the quotient is a whole number, then 3 and 6,690,185.6667 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 | 20,070,557 | |
| -1 | -20,070,557 |
Let's try dividing by 4:
20,070,557 ÷ 4 = 5,017,639.25
If the quotient is a whole number, then 4 and 5,017,639.25 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 | 20,070,557 | |
| -1 | 20,070,557 |
If you did it right, you will end up with this table:
| 1 | 13 | 17 | 197 | 221 | 461 | 2,561 | 3,349 | 5,993 | 7,837 | 43,537 | 90,817 | 101,881 | 1,180,621 | 1,543,889 | 20,070,557 |
| -1 | -13 | -17 | -197 | -221 | -461 | -2,561 | -3,349 | -5,993 | -7,837 | -43,537 | -90,817 | -101,881 | -1,180,621 | -1,543,889 | -20,070,557 |
Here are some more numbers to try:
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