A:
Positive:
1 x 201001455 x 402002913 x 154616565 x 309233109 x 184405545 x 368811417 x 141852837 x 7085
Negative:
-1 x -20100145-5 x -4020029-13 x -1546165-65 x -309233-109 x -184405-545 x -36881-1417 x -14185-2837 x -7085
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 20,100,145, 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 | 20,100,145 | |
| -1 | -20,100,145 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,100,145.
Example:
1 x 20,100,145 = 20,100,145
and
-1 x -20,100,145 = 20,100,145
Notice both answers equal 20,100,145
With that explanation out of the way, let's continue. Next, we take the number 20,100,145 and divide it by 2:
20,100,145 ÷ 2 = 10,050,072.5
If the quotient is a whole number, then 2 and 10,050,072.5 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 | 20,100,145 | |
| -1 | -20,100,145 |
Now, we try dividing 20,100,145 by 3:
20,100,145 ÷ 3 = 6,700,048.3333
If the quotient is a whole number, then 3 and 6,700,048.3333 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 | 20,100,145 | |
| -1 | -20,100,145 |
Let's try dividing by 4:
20,100,145 ÷ 4 = 5,025,036.25
If the quotient is a whole number, then 4 and 5,025,036.25 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 | 20,100,145 | |
| -1 | 20,100,145 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 109 | 545 | 1,417 | 2,837 | 7,085 | 14,185 | 36,881 | 184,405 | 309,233 | 1,546,165 | 4,020,029 | 20,100,145 |
| -1 | -5 | -13 | -65 | -109 | -545 | -1,417 | -2,837 | -7,085 | -14,185 | -36,881 | -184,405 | -309,233 | -1,546,165 | -4,020,029 | -20,100,145 |
Here are some more numbers to try:
Try the factor calculator