What is the Least Common Multiple of 19721 and 19728?

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 19721 and 19728 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 19721 and 19728, than apply into the LCM equation.

GCF(19721,19728) = 1
LCM(19721,19728) = ( 19721 × 19728) / 1
LCM(19721,19728) = 389055888 / 1
LCM(19721,19728) = 389055888

Least Common Multiple (LCM) of 19721 and 19728 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 19721 and 19728. First we will calculate the prime factors of 19721 and 19728.

Prime Factorization of 19721

Prime Factorization of 19728

Now multiplying the highest exponent prime factors to calculate the LCM of 19721 and 19728.

LCM(19721,19728) = 13¹ × 37¹ × 41¹ × 2⁴ × 3² × 137¹
LCM(19721,19728) = 389055888