What is the Least Common Multiple of 19705 and 19721?

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 19705 and 19721 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 19705 and 19721, than apply into the LCM equation.

GCF(19705,19721) = 1
LCM(19705,19721) = ( 19705 × 19721) / 1
LCM(19705,19721) = 388602305 / 1
LCM(19705,19721) = 388602305

Least Common Multiple (LCM) of 19705 and 19721 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 19705 and 19721. First we will calculate the prime factors of 19705 and 19721.

Prime Factorization of 19705

Prime Factorization of 19721

Now multiplying the highest exponent prime factors to calculate the LCM of 19705 and 19721.

LCM(19705,19721) = 5¹ × 7¹ × 563¹ × 13¹ × 37¹ × 41¹
LCM(19705,19721) = 388602305