There's no such thing as a least common numerator and even if there were, you'd need two of them to find something in common between them.
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20 is.
22 over 38 can be reduced by dividing both the numerator and denominator by their greatest common factor, which is 2. Therefore, 22 over 38 reduced is 11 over 19.
The Least Common Multiple (LCM) for 15 19 is 285.
The least common multiple of 19 , 6 , 12 = 228
The least common multiple of 19 , 4 , 20 = 380