What is the Least Common Multiple of 13620 and 13640?

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 13620 and 13640 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 13620 and 13640, than apply into the LCM equation.

GCF(13620,13640) = 20
LCM(13620,13640) = ( 13620 × 13640) / 20
LCM(13620,13640) = 185776800 / 20
LCM(13620,13640) = 9288840

Least Common Multiple (LCM) of 13620 and 13640 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 13620 and 13640. First we will calculate the prime factors of 13620 and 13640.

Prime Factorization of 13620

Prime Factorization of 13640

Now multiplying the highest exponent prime factors to calculate the LCM of 13620 and 13640.

LCM(13620,13640) = 2³ × 3¹ × 5¹ × 227¹ × 11¹ × 31¹
LCM(13620,13640) = 9288840