What is the Least Common Multiple of 39620 and 39640?

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 39620 and 39640 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 39620 and 39640, than apply into the LCM equation.

GCF(39620,39640) = 20
LCM(39620,39640) = ( 39620 × 39640) / 20
LCM(39620,39640) = 1570536800 / 20
LCM(39620,39640) = 78526840

Least Common Multiple (LCM) of 39620 and 39640 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 39620 and 39640. First we will calculate the prime factors of 39620 and 39640.

Prime Factorization of 39620

Prime Factorization of 39640

Now multiplying the highest exponent prime factors to calculate the LCM of 39620 and 39640.

LCM(39620,39640) = 2³ × 5¹ × 7¹ × 283¹ × 991¹
LCM(39620,39640) = 78526840