What is the Least Common Multiple of 21687 and 21707?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least Common Multiple of 21687 and 21707 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21687 and 21707, than apply into the LCM equation.

GCF(21687,21707) = 1
LCM(21687,21707) = ( 21687 × 21707) / 1
LCM(21687,21707) = 470759709 / 1
LCM(21687,21707) = 470759709

Least Common Multiple (LCM) of 21687 and 21707 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21687 and 21707. First we will calculate the prime factors of 21687 and 21707.

Prime Factorization of 21687

Prime Factorization of 21707

Now multiplying the highest exponent prime factors to calculate the LCM of 21687 and 21707.

LCM(21687,21707) = 3¹ × 7229¹ × 7² × 443¹
LCM(21687,21707) = 470759709