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Eight - all the prime numbers (the definition of which is a number with exactly two different factors) which are 2, 3, 5, 7, 11, 13, 17, 19.
It could be argued that any number with 3 or more different factors has 2 different factors (along with one or more other factors), which means all numbers less than 20 except 1 have two different factors, ie the 18 numbers 2-19; these numbers just don't all have exactly two different factors.
6: 2, 3
10: 2, 5
12: 2, 3
14: 2, 7
15: 3, 5
18: 2, 3
20: 2, 5
21: 3, 7
22: 2, 11
24: 2, 3
26: 2, 13
28: 2, 7
33: 3, 11
34: 2, 17
35: 5, 7
36: 2, 3
38: 2, 19
39: 3, 13
40: 2, 5
44: 2, 11
45: 3, 5
46: 2, 23
48: 2, 3
23 of them.
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What number below 160 has exactly 3 prime factors?
30, 42, 66, 78, 102, 105, 114, 138 all have exactly three distinct prime factors.
What is the prime factor of 1.06?
Prime factors refer to integers, not decimals.
How many natural numbers less than 1000 have exactly three distinct positive integer divisors?
Prime squares have three factors. There are 11 of them in that range.
What is a whole number when it has exactly 2 factors?
A prime number has exactly two factors: itself and 1.
What are the prime factors for 2-200?
202
Does 12 have prime factors?
Yes, 12 has prime factors. The prime factors of 12 are 2, 2, and 3, so the distinct prime factors are 2 and 3. Almost all integers have prime factors. The integers without prime factors are -1, 0, and 1.
What number has exactly 3 prime factors?
There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
What numbers have exactly 3 different prime factors?
There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
What number less than 100 has exactly 4 prime factors?
There is more than one possible answer. The prime factors of 16 are 2, 2, 2, and 2. It has four prime factors, but only one distinct prime factor. The prime factors of 24 are 2, 2, 2, and 3. It has four prime factors, but only two distinct prime factors. The prime factors of 36 are 2, 2, 3, and 3. It has four prime factors, but only two distinct prime factors. The prime factors of 40 are 2, 2, 2, and 5. It has four prime factors, but only two distinct prime factors. The prime factors of 54 are 2, 3, 3, and 3. It has four prime factors, but only two distinct prime factors. The prime factors of 56 are 2, 2, 2, and 7. It has four prime factors, but only two distinct prime factors. The prime factors of 60 are 2, 2, 3, and 5. It has four prime factors, but only three distinct prime factors. The prime factors of 81 are 3, 3, 3, and 3. It has four prime factors, but only one distinct prime factor. The prime factors of 84 are 2, 2, 3, and 7. It has four prime factors, but only three distinct prime factors. The prime factors of 88 are 2, 2, 2, and 11. It has four prime factors, but only two distinct prime factors. The prime factors of 90 are 2, 3, 3, and 5. It has four prime factors, but only three distinct prime factors.
What number below 160 has exactly 3 prime factors?
30, 42, 66, 78, 102, 105, 114, 138 all have exactly three distinct prime factors.
Does 20 have exactly 3 prime numbers?
The prime factorization of 20 is 2 x 2 x 5. That's three prime factors; two distinct prime factors.
How many distinct prime factors does 70 have?
The distinct prime factors of 70 are 2, 5, and 7, so it has three distinct prime factors.
How many distinct prime factors does 168 have?
Three distinct prime factors.
How many distinct factors does 45 have?
Six distinct factors Two distinct prime factors
Is 3 a prime number because it doesn't have any factors?
3 is a prime number because it has exactly two distinct factors. The only factors of a prime number are 1 and itself. The only factors of 3 are 1 and 3, so it is a prime number.
What number has only 7 factors?
There are an infinite number of integers with "only 7 factors". Any number which is the product of exactly 7 prime numbers.
What is the prime factorizations of 151875?
Prime Factors - 3,3,3,3,3,5,5,5,5 Distinct Prime factors are - 3,5
