The LCM of two consecutive even numbers is their product divided by two.
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No, 2 and 10 are factors of 20. The LCM of 2 and 10 is 10.
The LCM of two numbers is one of the numbers when one of the numbers is a multiple of the other. The LCM of two numbers is the product of the numbers when they are relatively prime. In all other cases (like consecutive even numbers that aren't 2 and 4) the LCM is as you describe.
If A is even, the LCM is A. Otherwise it is 2A.
You need at least two numbers to find an LCM.
You need at least two numbers to find an LCM.