What are the factors of 18 and 24?

2, 3, and 6 are factors common to 18 and 24. The factors of 18 are 1, 2, 3, 6, 9, and 18. The prime factors are 2, 3, 3.
The factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24. The prime factors are 2, 2, 2, 3.
The common factors of 18 and 24 are 1, 2, 3, and 6, and the GCF is 6.