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What is the Least Common Multiple of 1997 and 2003?

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 1997 and 2003 is 3999991.

LCM(1997,2003) = 3999991

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Least Common Multiple of 1997 and 2003 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1997 and 2003, than apply into the LCM equation.

GCF(1997,2003) = 1
LCM(1997,2003) = ( 1997 × 2003) / 1
LCM(1997,2003) = 3999991 / 1
LCM(1997,2003) = 3999991

Least Common Multiple (LCM) of 1997 and 2003 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1997 and 2003. First we will calculate the prime factors of 1997 and 2003.

Prime Factorization of 1997

Prime factors of 1997 are 1997. Prime factorization of 1997 in exponential form is:

1997 = 19971

Prime Factorization of 2003

Prime factors of 2003 are 2003. Prime factorization of 2003 in exponential form is:

2003 = 20031

Now multiplying the highest exponent prime factors to calculate the LCM of 1997 and 2003.

LCM(1997,2003) = 19971 × 20031
LCM(1997,2003) = 3999991