What is the Least Common Multiple of 19621 and 19640?

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 19621 and 19640 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 19621 and 19640, than apply into the LCM equation.

GCF(19621,19640) = 1
LCM(19621,19640) = ( 19621 × 19640) / 1
LCM(19621,19640) = 385356440 / 1
LCM(19621,19640) = 385356440

Least Common Multiple (LCM) of 19621 and 19640 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 19621 and 19640. First we will calculate the prime factors of 19621 and 19640.

Prime Factorization of 19621

Prime Factorization of 19640

Now multiplying the highest exponent prime factors to calculate the LCM of 19621 and 19640.

LCM(19621,19640) = 7¹ × 2803¹ × 2³ × 5¹ × 491¹
LCM(19621,19640) = 385356440