What is the Least Common Multiple of 15720 and 15740?

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 15720 and 15740 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 15720 and 15740, than apply into the LCM equation.

GCF(15720,15740) = 20
LCM(15720,15740) = ( 15720 × 15740) / 20
LCM(15720,15740) = 247432800 / 20
LCM(15720,15740) = 12371640

Least Common Multiple (LCM) of 15720 and 15740 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 15720 and 15740. First we will calculate the prime factors of 15720 and 15740.

Prime Factorization of 15720

Prime Factorization of 15740

Now multiplying the highest exponent prime factors to calculate the LCM of 15720 and 15740.

LCM(15720,15740) = 2³ × 3¹ × 5¹ × 131¹ × 787¹
LCM(15720,15740) = 12371640