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The factors of the number 12 are 1, 2, 3, 4, 6, 12, -1, -2, -3, -4, -6 and -12. There are exactly 12 factors of the number 12.

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The number with the most factors is infinite. The number with the most known factors contains all of the prime numbers, of which Euclid's theorem also suggests there is an infinite number.

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Factors are the numbers that are multiplied together to get another number. To find the factors of a given number, the number is divided by other numbers smaller than the given number, as the factor of any number cannot be greater than the number itself.

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The following numbers under 100 have the most factors: 60, 72, 84, 90 and 96. They each have a total of 12 factors, including the number one and the number itself.

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The numbers between 30 and 40 whose only factors are one and themselves, also called prime numbers, are 31 and 37. Prime numbers are useful in generating numerical passwords or codes that are difficult to crack.

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A number with more than two factors is called a composite number. A factor is a number that is evenly divisible into another number. Prime numbers, by definition must be larger than one and have only themselves and one as factors.

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There are six factors of the number 18. The factors are one, two, three, six, nine and 18. Each of these numbers can divide the number 18 without a remainder, making them factors of 18.

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The factors of the number 23 are 23 and 1. Factors of a number are the numbers that are multiplied together to equal the given number.

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Numbers less than 100 that have exactly three factors are four, nine, 25 and 49. All of these numbers are squares of prime numbers, which means that their only factors are one, themselves and their square roots. Two squared is four, three squared is nine, five squared is 25 and seven squared is 49.

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Eight is the greatest common factor for the numbers 16 and 40. The factors of a particular number are those numbers that divide into it evenly, leaving no remainder. The greatest common factor between two numbers is the highest number that divides evenly into both of them.