Any Prime number - by definition such numbers are divisible by 1 and the number itself.
As a matter of fact, only perfect squares can have an odd number of factors.
The number 12 has a total of six divisors: 1, 2, 3, 4, 6, 12.
numbers 1, 2, 3, 4, 5, 8, 16 are divisors number 16 numbers 1, 2, 3, 4, 5, 6, 10, 20 are divisors number 20 numbers 1, 2, 3, 4, 6, 8, 12, 24 are divisors number 24 numbers 1, 2, 3, 4, 7, 12, 28 are divisors number 28 next number is 32 and divisors are 1, 2, 4, 8, 16, 32
The first number to have exactly 10 divisors is 48.
60. The number 60 has 12 divisors if you are counting the 1 and 60. The divisors (given as factor pairs) are 1, 60, 2, 30, 3, 20, 4, 15, 5, 12, 6, 10.
First, you want to know the definition of a perfect number: A perfect number is an integer which is equal to the sum of all its positive integer divisors that are less than itself. Example: The positive integer divisors of 6, less than 6, are 1, 2, and 3. The sum of those divisors is 1 + 2 + 3 = 6. Therefore, 6 is a perfect number. Now, 21 does not meet this definition and therefore is not a perfect number. Let's try it. There are three positive divisors of 21, namely, 1, 3, and 7, that are less than 21, itself. (There are no others.) But the sum of these divisors is 1 + 3 + 7 = 11, which is not equal to 21. Therefore, we confirm that 21 is not a perfect number.
The divisors of 21 are: 1, 3, 7, 21.
The divisors of 18 are: 1, 2, 3, 6, 9, 18.
Count of divisors: 12 Factorization: 3 * 3 * 7 * 11 Divisors: 1, 3, 7, 9, 11, 21, 33, 63, 77, 99, 231, 693 Sum of divisors: 1248 Number 693 is pronounced six hundred ninety three. Number 693 is a composite number. Factors of 693 are 3 * 3 * 7 * 11. Number 693 has 12 divisors: 1, 3, 7, 9, 11, 21, 33, 63, 77, 99, 231, 693. Sum of the divisors is 1248. Number 693 is not a Fibonacci number. It is not a Bell number. Number 693 is not a Catalan number.
2 and 3
The number 12 has a total of six divisors: 1, 2, 3, 4, 6, 12.
A perfect number is the sum of its divisors; for example 6 is a perfect number because the sum of its divisors is 6 (1 + 2 + 3). The sum of the divisors of 8 is 7 (1 + 2 + 4), so 8 is not a perfect number.
numbers 1, 2, 3, 4, 5, 8, 16 are divisors number 16 numbers 1, 2, 3, 4, 5, 6, 10, 20 are divisors number 20 numbers 1, 2, 3, 4, 6, 8, 12, 24 are divisors number 24 numbers 1, 2, 3, 4, 7, 12, 28 are divisors number 28 next number is 32 and divisors are 1, 2, 4, 8, 16, 32
There are 8 divisors of 105 (viz: 1, 3, 5, 7, 15, 21, 35, 105)
There are eight divisors of the number 195.
Thet are 2 and 3
A perfect number is equal to the sum of its proper divisors (the factors excluding the number itself.) 6 is a perfect number. Its proper divisors are 1, 2 and 3.
The smallest number with exactly 14 divisors is 192. The divisors are 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, and 192 itself.