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What is the Least Common Multiple of 13805 and 13820?

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 13805 and 13820 is 38157020.

LCM(13805,13820) = 38157020

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Least Common Multiple of 13805 and 13820 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 13805 and 13820, than apply into the LCM equation.

GCF(13805,13820) = 5
LCM(13805,13820) = ( 13805 × 13820) / 5
LCM(13805,13820) = 190785100 / 5
LCM(13805,13820) = 38157020

Least Common Multiple (LCM) of 13805 and 13820 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 13805 and 13820. First we will calculate the prime factors of 13805 and 13820.

Prime Factorization of 13805

Prime factors of 13805 are 5, 11, 251. Prime factorization of 13805 in exponential form is:

13805 = 51 × 111 × 2511

Prime Factorization of 13820

Prime factors of 13820 are 2, 5, 691. Prime factorization of 13820 in exponential form is:

13820 = 22 × 51 × 6911

Now multiplying the highest exponent prime factors to calculate the LCM of 13805 and 13820.

LCM(13805,13820) = 51 × 111 × 2511 × 22 × 6911
LCM(13805,13820) = 38157020