No, all prime numbers are deficient.
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abundant
Yes, this is well known. All integral multiples of any perfect, or abundant number must be an abundant number.
25 is not an abundant number because the sum of its divisors is less than half of 25. The lowest odd abundant number is 945.
In number theory, an abundant number is a number for which the sum of its proper divisors is greater than the number itself.
No.