It is number 16 because 16 has 1, 2, 4, 8, and 16 itself.
16
48
1 and 5
The factors of 4 are 1, 2, and 4. The only prime factor of 4 is 2. The factors of 20 are 1, 2, 4, 5, 10, and 20. The prime factors of 20 are 2x2x5.
It is 29 because it's a prime number
16
16
16 does.
16
16
48
48
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.
16 has five factors.
16 has five factors.