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The number itself becomes double.
How to know that you found all the factors for example my teacher taught me that when u reach a double diget number that is all the factors. ( 6x6)-~ double diget number
The factors of 2 are 1 and 2. If you increase something by a factor of 2, you double it. If you decrease something by a factor of 2, you halve it.
Factors of 90 will be factors of 180.
factors: 1, 449prime factors: 449