The LCM of 20 and 21 is 420. The LCM of any pair of consecutive integers is their product.
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Their product, which is 420.
The least common multiple of 21 , 19 = 399
The least common multiple of the numbers 21 and 113 is 2,373.
The least common multiple of 12 , 21 , 45 = 1,260
The Least Common Multiple (LCM) of the numbers 21, 149 is 3,129.