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A number will always have 1 and itself as factors. And thus the only numbers with 2 factors will be prime numbers. The only prime numbers below 20 are 2, 3, 5, 7, 11, 13, 17 and 19, and thus these are the only numbers below 20 that have 2 factors.

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Q: What numbers below 20 have 2 factors?
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Related questions

Which factors of 20 are prime numbers?

The prime factors of 20 are 2, 2, and 5.


Which numbers below are factors of 80?

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2 and 20 have an HCF of 2 and an LCM of 20. You could also use 4 and 10.


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'''They called composite numbers.''' '''Composite numbers are when they have more than two factors.''' '''A prime number is when it only has 2 factors no more or less.''' '''EX : 20''' '''Factors Of 20 : 1, 20, 2, 10, 4, 5.'''


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The common factors of 8, 20, and 36 are the numbers that can divide each of these numbers without leaving a remainder. The factors of 8 are 1, 2, 4, and 8. The factors of 20 are 1, 2, 4, 5, 10, and 20. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The common factors of 8, 20, and 36 are 1, 2, and 4.


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