What is the Least Common Multiple of 30405 and 30420?

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 30405 and 30420 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 30405 and 30420, than apply into the LCM equation.

GCF(30405,30420) = 15
LCM(30405,30420) = ( 30405 × 30420) / 15
LCM(30405,30420) = 924920100 / 15
LCM(30405,30420) = 61661340

Least Common Multiple (LCM) of 30405 and 30420 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 30405 and 30420. First we will calculate the prime factors of 30405 and 30420.

Prime Factorization of 30405

Prime Factorization of 30420

Now multiplying the highest exponent prime factors to calculate the LCM of 30405 and 30420.

LCM(30405,30420) = 3² × 5¹ × 2027¹ × 2² × 13²
LCM(30405,30420) = 61661340