What is the Least Common Multiple of 86400 and 86420?

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 86400 and 86420 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 86400 and 86420, than apply into the LCM equation.

GCF(86400,86420) = 20
LCM(86400,86420) = ( 86400 × 86420) / 20
LCM(86400,86420) = 7466688000 / 20
LCM(86400,86420) = 373334400

Least Common Multiple (LCM) of 86400 and 86420 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 86400 and 86420. First we will calculate the prime factors of 86400 and 86420.

Prime Factorization of 86400

Prime Factorization of 86420

Now multiplying the highest exponent prime factors to calculate the LCM of 86400 and 86420.

LCM(86400,86420) = 2⁷ × 3³ × 5² × 29¹ × 149¹
LCM(86400,86420) = 373334400