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210, 330, 390, 420 and 462

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They are 210, 330, 390, 420, 462.

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My answer is 210, 330, 390, 420 and 462

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Q: What are the numbers less than 500 which have four different prime factors?

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the least number is 210 which is divisible by four different prime numbers.

420 has four prime factors: 2,3,5,7

420 has four prime factors. Prime factors don't usually travel in pairs.

39 is not a prime number because it has four factors: 1,3,13,39 and because prime number are numbers who has 2 factors.

If the two prime numbers are different: You get the two prime numbers, plus 1, plus the product. For example, if you multiply 2 x 3 = 6, the factors of 6 are 2, 3, 1, and 6. If the two prime numbers are the same: You get the prime number, 1, and the product. For example 2 x 2 = 4. The factors of 4 are 2, 1, 4.

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Logically, the smallest number with 4 different prime factors would have to be the product of the smallest four prime numbers. So the smallest natural number with four different prime factors is 210 (2*3*5*7).

420 has 5 prime factors, four of which are different prime numbers. Prime factors of 420 are 2 x 2 x 5 x 3 x 7.

They are numbers that are the product of two different prime numbers. If the primes are p and q, the four factors are 1, p, q and pq.

47 does not have 4 prime numbers (factors or divisors).

336

the least number is 210 which is divisible by four different prime numbers.

420 has four prime factors: 2,3,5,7

210 is the number whose prime factors are the first four primes unrepeated.

420 has four prime factors. Prime factors don't usually travel in pairs.

Every product of two prime numbers has four factors.

That's an infinite list. 210 is on it.

39 is not a prime number because it has four factors: 1,3,13,39 and because prime number are numbers who has 2 factors.