What is the Least Common Multiple of 21709 and 21720?

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 21709 and 21720 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21709 and 21720, than apply into the LCM equation.

GCF(21709,21720) = 1
LCM(21709,21720) = ( 21709 × 21720) / 1
LCM(21709,21720) = 471519480 / 1
LCM(21709,21720) = 471519480

Least Common Multiple (LCM) of 21709 and 21720 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21709 and 21720. First we will calculate the prime factors of 21709 and 21720.

Prime Factorization of 21709

Prime Factorization of 21720

Now multiplying the highest exponent prime factors to calculate the LCM of 21709 and 21720.

LCM(21709,21720) = 17¹ × 1277¹ × 2³ × 3¹ × 5¹ × 181¹
LCM(21709,21720) = 471519480