A:
Positive:
1 x 201014877 x 287164119 x 1057973133 x 151139359 x 55993421 x 477472513 x 79992947 x 6821
Negative:
-1 x -20101487-7 x -2871641-19 x -1057973-133 x -151139-359 x -55993-421 x -47747-2513 x -7999-2947 x -6821
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 20,101,487, 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 | 20,101,487 | |
| -1 | -20,101,487 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,101,487.
Example:
1 x 20,101,487 = 20,101,487
and
-1 x -20,101,487 = 20,101,487
Notice both answers equal 20,101,487
With that explanation out of the way, let's continue. Next, we take the number 20,101,487 and divide it by 2:
20,101,487 ÷ 2 = 10,050,743.5
If the quotient is a whole number, then 2 and 10,050,743.5 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 | 20,101,487 | |
| -1 | -20,101,487 |
Now, we try dividing 20,101,487 by 3:
20,101,487 ÷ 3 = 6,700,495.6667
If the quotient is a whole number, then 3 and 6,700,495.6667 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 | 20,101,487 | |
| -1 | -20,101,487 |
Let's try dividing by 4:
20,101,487 ÷ 4 = 5,025,371.75
If the quotient is a whole number, then 4 and 5,025,371.75 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 | 20,101,487 | |
| -1 | 20,101,487 |
If you did it right, you will end up with this table:
| 1 | 7 | 19 | 133 | 359 | 421 | 2,513 | 2,947 | 6,821 | 7,999 | 47,747 | 55,993 | 151,139 | 1,057,973 | 2,871,641 | 20,101,487 |
| -1 | -7 | -19 | -133 | -359 | -421 | -2,513 | -2,947 | -6,821 | -7,999 | -47,747 | -55,993 | -151,139 | -1,057,973 | -2,871,641 | -20,101,487 |
Here are some more numbers to try:
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