16
It is 29 because it's a prime number
48
There are no common factors between these values since 11 is prime and 20 is composite. Then, there are no common prime factors between these values.
The difference is between factor pairs and distinct factors. With square numbers, one of the factor pairs will be the same number twice. When listing the distinct factors, that number is only listed once.
16 has five factors.
5, 10, 15 and 20 have five as a factor. The number 16 has five factors.
16 has five factors.
16
16 has five factors.
20 and 28 both have six factors.
The factors of 16 are 1, 2, 4, 8, and 16.
12, 18 and 20 each have six factors.
30 is the only number between 20 and 50 that is a factor of 60
16
12
28