What is the Least Common Multiple of 20815 and 20820?

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 20815 and 20820 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 20815 and 20820, than apply into the LCM equation.

GCF(20815,20820) = 5
LCM(20815,20820) = ( 20815 × 20820) / 5
LCM(20815,20820) = 433368300 / 5
LCM(20815,20820) = 86673660

Least Common Multiple (LCM) of 20815 and 20820 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 20815 and 20820. First we will calculate the prime factors of 20815 and 20820.

Prime Factorization of 20815

Prime Factorization of 20820

Now multiplying the highest exponent prime factors to calculate the LCM of 20815 and 20820.

LCM(20815,20820) = 5¹ × 23¹ × 181¹ × 2² × 3¹ × 347¹
LCM(20815,20820) = 86673660