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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Six numbers. They are 1, 2, 4, 5, 10 and 20.
1, 2 & 4.
The factors of 20 are: 1, 2, 4, 5, 10, and 20.The factors of 24 are: 1, 2, 3, 4, 6, 8, 12, and 24.The factors common to 20 and 24 are: 1, 2, and 4.The greatest factor common to 20 and 24 is: 4.
The factors of 20 are 1, 2, 4, 5, 10, and 20.1, 2, 4, 5, 10, 201, 2, 4, 5, 10, 20.Its factors are: 1 2 4 5 10 and 20
To find the common factors of 30 and 20, we first list the factors of each number. The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The factors of 20 are 1, 2, 4, 5, 10, and 20. The factors that are common to both numbers are 1, 2, 5, and 10.