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What is the Least Common Multiple of 1409 and 1420?

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 1409 and 1420 is 2000780.

LCM(1409,1420) = 2000780

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Least Common Multiple of 1409 and 1420 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1409 and 1420, than apply into the LCM equation.

GCF(1409,1420) = 1
LCM(1409,1420) = ( 1409 × 1420) / 1
LCM(1409,1420) = 2000780 / 1
LCM(1409,1420) = 2000780

Least Common Multiple (LCM) of 1409 and 1420 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1409 and 1420. First we will calculate the prime factors of 1409 and 1420.

Prime Factorization of 1409

Prime factors of 1409 are 1409. Prime factorization of 1409 in exponential form is:

1409 = 14091

Prime Factorization of 1420

Prime factors of 1420 are 2, 5, 71. Prime factorization of 1420 in exponential form is:

1420 = 22 × 51 × 711

Now multiplying the highest exponent prime factors to calculate the LCM of 1409 and 1420.

LCM(1409,1420) = 14091 × 22 × 51 × 711
LCM(1409,1420) = 2000780