The prime factors are: 2 x 2 x 5
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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's not, because all the factors of 20 aren't prime.
Prime numbers have two factors. Prime squares have three factors. Square numbers have an odd number of factors but that number varies.
If the numbers are prime numbers, the prime factor of each number is the number itself. If the numbers are not prime numbers, the prime factors of each number are each of the prime numbers by which the number in question can be divided without a remainder.
It is 29 because it's a prime number