The common factor of 1, 2, and 4 is 1.
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2 is a factor of 4, and 4 is a factor of 4. One (1) is also a factor, but it's not even.
4 and 12 are both even numbers greater than 2. They are composite numbers because 2 is a factor in addition to 1 and itself.
There are square numbers (numbers which are a square of an integer), such as 4. It's factors, listed are 1, 2, and 4. All square numbers have an odd number of factors. Then there's 1, which has only 1 factor: 1. All other numbers have an even number of factors. Prime numbers will have only 2 factors (2 is even).
There is an infinite number of numbers which are not factors of 124. They are all numbers apart from 1, 2, 4, 31, 62, 124.
1, 2, 4, 5, 8, 10, 20, 40