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The term common factors specifically refers to the factors shared by two or more numbers. Since 19 is a single number, you could say that it shares all of its factors with itself.
19 is a Prime number. It is only evenly divisible by itself and one.

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14y ago
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13y ago

The PROPER factor of 19 is 1 and just 1. Since 19 is a prime number its only proper factor is 1. Any prime number only has 1 proper factor which is 1.

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8y ago

1, 19

1, 2, 4, 5, 10, 20

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11y ago

1,19

1,2,4,5,10,20

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11y ago

1 and 19

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8y ago

1 and 19

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Q: What are factors of 19 and 20?
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