The greatest factor of any positive number is the number itself.
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GCF of a prime number and a composite number is 1 if the prime number is not a factor of the composite number. Here 103 is a prime number and 120 is a composite number. And 120 is not divisible by 103(or 103 is not a factor of 120). So, GCF(103,120) = 1
Since 103 is a prime number, the prime factorization of 103 is simply 103.
The greatest common factor of 12 and 20 is 4
103 is prime, so it's only factors are 1,103
The Greatest Common Factor (GCF) is: 8