What is the Least Common Multiple of 20645 and 20660?

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 20645 and 20660 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 20645 and 20660, than apply into the LCM equation.

GCF(20645,20660) = 5
LCM(20645,20660) = ( 20645 × 20660) / 5
LCM(20645,20660) = 426525700 / 5
LCM(20645,20660) = 85305140

Least Common Multiple (LCM) of 20645 and 20660 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 20645 and 20660. First we will calculate the prime factors of 20645 and 20660.

Prime Factorization of 20645

Prime Factorization of 20660

Now multiplying the highest exponent prime factors to calculate the LCM of 20645 and 20660.

LCM(20645,20660) = 5¹ × 4129¹ × 2² × 1033¹
LCM(20645,20660) = 85305140