A:
Positive:
1 x 205453155 x 41090637 x 293504535 x 587009281 x 731151405 x 146231967 x 104452089 x 9835
Negative:
-1 x -20545315-5 x -4109063-7 x -2935045-35 x -587009-281 x -73115-1405 x -14623-1967 x -10445-2089 x -9835
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 20,545,315, 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 | 20,545,315 | |
| -1 | -20,545,315 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,545,315.
Example:
1 x 20,545,315 = 20,545,315
and
-1 x -20,545,315 = 20,545,315
Notice both answers equal 20,545,315
With that explanation out of the way, let's continue. Next, we take the number 20,545,315 and divide it by 2:
20,545,315 ÷ 2 = 10,272,657.5
If the quotient is a whole number, then 2 and 10,272,657.5 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 | 20,545,315 | |
| -1 | -20,545,315 |
Now, we try dividing 20,545,315 by 3:
20,545,315 ÷ 3 = 6,848,438.3333
If the quotient is a whole number, then 3 and 6,848,438.3333 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 | 20,545,315 | |
| -1 | -20,545,315 |
Let's try dividing by 4:
20,545,315 ÷ 4 = 5,136,328.75
If the quotient is a whole number, then 4 and 5,136,328.75 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 | 20,545,315 | |
| -1 | 20,545,315 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 281 | 1,405 | 1,967 | 2,089 | 9,835 | 10,445 | 14,623 | 73,115 | 587,009 | 2,935,045 | 4,109,063 | 20,545,315 |
| -1 | -5 | -7 | -35 | -281 | -1,405 | -1,967 | -2,089 | -9,835 | -10,445 | -14,623 | -73,115 | -587,009 | -2,935,045 | -4,109,063 | -20,545,315 |
Here are some more numbers to try:
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