A:
Positive:
1 x 20560564713 x 1581581967 x 3068741113 x 1819519871 x 2360571469 x 1399632089 x 984237571 x 27157
Negative:
-1 x -205605647-13 x -15815819-67 x -3068741-113 x -1819519-871 x -236057-1469 x -139963-2089 x -98423-7571 x -27157
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 205,605,647, 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 | 205,605,647 | |
| -1 | -205,605,647 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 205,605,647.
Example:
1 x 205,605,647 = 205,605,647
and
-1 x -205,605,647 = 205,605,647
Notice both answers equal 205,605,647
With that explanation out of the way, let's continue. Next, we take the number 205,605,647 and divide it by 2:
205,605,647 ÷ 2 = 102,802,823.5
If the quotient is a whole number, then 2 and 102,802,823.5 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 | 205,605,647 | |
| -1 | -205,605,647 |
Now, we try dividing 205,605,647 by 3:
205,605,647 ÷ 3 = 68,535,215.6667
If the quotient is a whole number, then 3 and 68,535,215.6667 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 | 205,605,647 | |
| -1 | -205,605,647 |
Let's try dividing by 4:
205,605,647 ÷ 4 = 51,401,411.75
If the quotient is a whole number, then 4 and 51,401,411.75 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 | 205,605,647 | |
| -1 | 205,605,647 |
If you did it right, you will end up with this table:
| 1 | 13 | 67 | 113 | 871 | 1,469 | 2,089 | 7,571 | 27,157 | 98,423 | 139,963 | 236,057 | 1,819,519 | 3,068,741 | 15,815,819 | 205,605,647 |
| -1 | -13 | -67 | -113 | -871 | -1,469 | -2,089 | -7,571 | -27,157 | -98,423 | -139,963 | -236,057 | -1,819,519 | -3,068,741 | -15,815,819 | -205,605,647 |
Here are some more numbers to try:
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