A:
Positive:
1 x 1616300217 x 2309000329 x 5573449203 x 796207709 x 2279691123 x 1439274963 x 325677861 x 20561
Negative:
-1 x -161630021-7 x -23090003-29 x -5573449-203 x -796207-709 x -227969-1123 x -143927-4963 x -32567-7861 x -20561
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 161,630,021, 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 | 161,630,021 | |
| -1 | -161,630,021 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 161,630,021.
Example:
1 x 161,630,021 = 161,630,021
and
-1 x -161,630,021 = 161,630,021
Notice both answers equal 161,630,021
With that explanation out of the way, let's continue. Next, we take the number 161,630,021 and divide it by 2:
161,630,021 ÷ 2 = 80,815,010.5
If the quotient is a whole number, then 2 and 80,815,010.5 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 | 161,630,021 | |
| -1 | -161,630,021 |
Now, we try dividing 161,630,021 by 3:
161,630,021 ÷ 3 = 53,876,673.6667
If the quotient is a whole number, then 3 and 53,876,673.6667 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 | 161,630,021 | |
| -1 | -161,630,021 |
Let's try dividing by 4:
161,630,021 ÷ 4 = 40,407,505.25
If the quotient is a whole number, then 4 and 40,407,505.25 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 | 161,630,021 | |
| -1 | 161,630,021 |
If you did it right, you will end up with this table:
| 1 | 7 | 29 | 203 | 709 | 1,123 | 4,963 | 7,861 | 20,561 | 32,567 | 143,927 | 227,969 | 796,207 | 5,573,449 | 23,090,003 | 161,630,021 |
| -1 | -7 | -29 | -203 | -709 | -1,123 | -4,963 | -7,861 | -20,561 | -32,567 | -143,927 | -227,969 | -796,207 | -5,573,449 | -23,090,003 | -161,630,021 |
Here are some more numbers to try:
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