What is the Least Common Multiple of 19715 and 19720?

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 19715 and 19720 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 19715 and 19720, than apply into the LCM equation.

GCF(19715,19720) = 5
LCM(19715,19720) = ( 19715 × 19720) / 5
LCM(19715,19720) = 388779800 / 5
LCM(19715,19720) = 77755960

Least Common Multiple (LCM) of 19715 and 19720 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 19715 and 19720. First we will calculate the prime factors of 19715 and 19720.

Prime Factorization of 19715

Prime Factorization of 19720

Now multiplying the highest exponent prime factors to calculate the LCM of 19715 and 19720.

LCM(19715,19720) = 5¹ × 3943¹ × 2³ × 17¹ × 29¹
LCM(19715,19720) = 77755960