What are the factors and prime factors of 27?

The factors of 27 are 1, 3, 9, and 27.

The factor pairs of 27 are 1 x 27 and 3 x 9.

The proper factors of 27 are 1, 3, and 9 or,

if the definition you are using excludes 1, they are 3 and 9.

The prime factors of 27 are 3, 3, and 3.

Note: There is repetition of these factors, so if the prime factors are being listed instead of the prime factorization, usually only the distinct prime factors are listed.

The only distinct prime factor is 3. The prime factorization of 27 is 3 x 3 x 3 or, in index form (in other Words, using exponents), 33.

NOTE: There cannot be common factors, a greatest common factor, or a least common multiple because "common" refers to factors or multiples that two or more numbers have in common.