14620
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The LCM of 20, 68, and 86 is 14620.
14620
That would be 612. 68 is not divisible by 9 until it reaches 68x9, which is 612, so that makes it the LCM.
68. 68 is divisible by 17.
The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least multiple of a number is itself.