What is the Least Common Multiple of 20415 and 20428?

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 20415 and 20428 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 20415 and 20428, than apply into the LCM equation.

GCF(20415,20428) = 1
LCM(20415,20428) = ( 20415 × 20428) / 1
LCM(20415,20428) = 417037620 / 1
LCM(20415,20428) = 417037620

Least Common Multiple (LCM) of 20415 and 20428 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 20415 and 20428. First we will calculate the prime factors of 20415 and 20428.

Prime Factorization of 20415

Prime Factorization of 20428

Now multiplying the highest exponent prime factors to calculate the LCM of 20415 and 20428.

LCM(20415,20428) = 3¹ × 5¹ × 1361¹ × 2² × 5107¹
LCM(20415,20428) = 417037620