A:
Positive:
1 x 201302155 x 40260437 x 287574519 x 105948535 x 57514995 x 211897133 x 151355665 x 30271
Negative:
-1 x -20130215-5 x -4026043-7 x -2875745-19 x -1059485-35 x -575149-95 x -211897-133 x -151355-665 x -30271
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 20,130,215, 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 | 20,130,215 | |
| -1 | -20,130,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,130,215.
Example:
1 x 20,130,215 = 20,130,215
and
-1 x -20,130,215 = 20,130,215
Notice both answers equal 20,130,215
With that explanation out of the way, let's continue. Next, we take the number 20,130,215 and divide it by 2:
20,130,215 ÷ 2 = 10,065,107.5
If the quotient is a whole number, then 2 and 10,065,107.5 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 | 20,130,215 | |
| -1 | -20,130,215 |
Now, we try dividing 20,130,215 by 3:
20,130,215 ÷ 3 = 6,710,071.6667
If the quotient is a whole number, then 3 and 6,710,071.6667 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 | 20,130,215 | |
| -1 | -20,130,215 |
Let's try dividing by 4:
20,130,215 ÷ 4 = 5,032,553.75
If the quotient is a whole number, then 4 and 5,032,553.75 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 | 20,130,215 | |
| -1 | 20,130,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 19 | 35 | 95 | 133 | 665 | 30,271 | 151,355 | 211,897 | 575,149 | 1,059,485 | 2,875,745 | 4,026,043 | 20,130,215 |
| -1 | -5 | -7 | -19 | -35 | -95 | -133 | -665 | -30,271 | -151,355 | -211,897 | -575,149 | -1,059,485 | -2,875,745 | -4,026,043 | -20,130,215 |
Here are some more numbers to try:
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