The least common multiple (LCM) of numbers a and b is the smallest positive integer that is divisible by both a and b.
To find the LCM of 20 and 88, proceed as follows:
* List all prime factors of each number:
20 = 2 x 2 x 5
88 = 2 x 2 x 2 x 11
* Multiply all prime numbers found as many times as they occur most often.
LCM = 2 x 2 x 2 x 5 x 11
LCM = 440