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What is the Least Common Multiple of 18815 and 18820?

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 (LCM) of 18815 and 18820 is 70819660.

LCM(18815,18820) = 70819660

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Least Common Multiple of 18815 and 18820 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 18815 and 18820, than apply into the LCM equation.

GCF(18815,18820) = 5
LCM(18815,18820) = ( 18815 × 18820) / 5
LCM(18815,18820) = 354098300 / 5
LCM(18815,18820) = 70819660

Least Common Multiple (LCM) of 18815 and 18820 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 18815 and 18820. First we will calculate the prime factors of 18815 and 18820.

Prime Factorization of 18815

Prime factors of 18815 are 5, 53, 71. Prime factorization of 18815 in exponential form is:

18815 = 51 × 531 × 711

Prime Factorization of 18820

Prime factors of 18820 are 2, 5, 941. Prime factorization of 18820 in exponential form is:

18820 = 22 × 51 × 9411

Now multiplying the highest exponent prime factors to calculate the LCM of 18815 and 18820.

LCM(18815,18820) = 51 × 531 × 711 × 22 × 9411
LCM(18815,18820) = 70819660