Four has only three factors: 1 2 4.
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The least 4 factors of 144 are 1, 2, 3, and 4 .
( 4/5)/(4/1) = (4/5)*(1/4) = 4 factors out therefore 5
Six has four factors and is in between the twin primes 5 and 7.
There are a few numbers that are less than 19 and have more than 4 factors. The number 10 is less than 19 and has more than four factors.
Any number that is the product of two primes (excluding itself and 1) has 4 factors. For example 21 has 4 factors: 1, 3, 7, 21; of which 3 and 7 are both prime.