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What is the Least Common Multiple of 20721 and 20729?

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 20721 and 20729 is 429525609.

LCM(20721,20729) = 429525609

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Least Common Multiple of 20721 and 20729 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 20721 and 20729, than apply into the LCM equation.

GCF(20721,20729) = 1
LCM(20721,20729) = ( 20721 × 20729) / 1
LCM(20721,20729) = 429525609 / 1
LCM(20721,20729) = 429525609

Least Common Multiple (LCM) of 20721 and 20729 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 20721 and 20729. First we will calculate the prime factors of 20721 and 20729.

Prime Factorization of 20721

Prime factors of 20721 are 3, 6907. Prime factorization of 20721 in exponential form is:

20721 = 31 × 69071

Prime Factorization of 20729

Prime factors of 20729 are 19, 1091. Prime factorization of 20729 in exponential form is:

20729 = 191 × 10911

Now multiplying the highest exponent prime factors to calculate the LCM of 20721 and 20729.

LCM(20721,20729) = 31 × 69071 × 191 × 10911
LCM(20721,20729) = 429525609