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The divisors of 21 are: 1, 3, 7, 21.
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Is the number 21 abundant or deficient or perfect?
It is deficient: It's only proper divisors are 1, 3, and 7, which sums to 11, which is less than 21.
What number has more positive integral divisors 2008 or 2009?
Answer: 2008. d(n) is number of divisors of n. I give number of divisors and list them also. The divisors of n = 2008: 1, 2, 4, 8, 251, 502, 1004, 2008 d(2008) = 8 The divisors of n = 2009: 1, 7, 41, 49, 287, 2009 d(2009) = 6
Is the number 14 a abundant perfect or deficient number?
14 is deficient. It is less than the sum of it's divisors. In mathematics, a deficient number or defective number is a number n for which σ(n) < 2n. Here σ(n) is the sum-of-divisors function: the sum of all positive divisors of n, including n itself Proof.. divisors of 14 are 1,2, and 7 and 14. Now, 2n=28 and and the sum the all the divisors including 14 is 24<28
What is the smallest number with 10 divisors?
48
What are the divisors of 6?
the divisors of 6 are: 1,2,3, and 6.
Why 21 is not a perfect number?
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.
What is the number of divisors for 105?
There are 8 divisors of 105 (viz: 1, 3, 5, 7, 15, 21, 35, 105)
What is a defcient number?
It is a number for which the sum of the proper divisors is less the the number. Example: 21 has divisors 1, 3, and 7. The sum is 11 which is less than 21. Note: All prime numbers are deficient and as there are an infinite number of them, there are an infinite set of deficient numbers too.
What are the divisors for the number 42?
1, 2, 3, 6, 7, 14, 21, 42.
What is the divisors of 21?
231 has 8 divisors.
How many divisors are there for the number 195?
There are eight divisors of the number 195.
Which number can we add that can give us 693?
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.
What are the divisors of 147?
The divisors of 147 are 1, 3, 7, 21, 49, 147.
What are the divisors of 63?
The divisors of 63 are: 1, 3, 7, 9, 21, 63.
How many divisors does the number 23 have?
23 is a prime number. It has two divisors.
What is a perfect Abundant Or dificient number?
A perfect number equals the sum of its proper divisors. A deficient number is greater than the sum of its proper divisors. An abundant number is less than the sum of its proper divisors. Proper divisors of a number do not include the number itself.
What number has exactly 10 divisors?
The first number to have exactly 10 divisors is 48.
