What is the Least Common Multiple of 19685 and 19705?

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 19685 and 19705 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 19685 and 19705, than apply into the LCM equation.

GCF(19685,19705) = 5
LCM(19685,19705) = ( 19685 × 19705) / 5
LCM(19685,19705) = 387892925 / 5
LCM(19685,19705) = 77578585

Least Common Multiple (LCM) of 19685 and 19705 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 19685 and 19705. First we will calculate the prime factors of 19685 and 19705.

Prime Factorization of 19685

Prime Factorization of 19705

Now multiplying the highest exponent prime factors to calculate the LCM of 19685 and 19705.

LCM(19685,19705) = 5¹ × 31¹ × 127¹ × 7¹ × 563¹
LCM(19685,19705) = 77578585