The factors of 27 are 1, 3, 9, and 27.The factor pairs of 27 are (1 x 27) and (3 x 9). To find the factor of 27, or any number, start with 1 and write out all the factor pairs until the numbers start to repeat in reverse order. 1, 3, 9, 27 Its factors are: 1, 3, 9 and 27.The only prime factor of 27 is 3.The prime factorization of 27 is 3 x 3 x 3 = 27.