20324013251 has 4 divisors (see below), whose sum is σ = 20521333872. Its totient is φ = 20126692632.

The previous prime is 20324013097. The next prime is 20324013263. The reversal of 20324013251 is 15231042302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20324013251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20324010251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98660156 + ... + 98660361.

It is an arithmetic number, because the mean of its divisors is an integer number (5130333468).

Almost surely, 2^20324013251 is an apocalyptic number.

20324013251 is a deficient number, since it is larger than the sum of its proper divisors (197320621).

20324013251 is a wasteful number, since it uses less digits than its factorization.

20324013251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197320620.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 20324013251 its reverse (15231042302), we get a palindrome (35555055553).

The spelling of 20324013251 in words is "twenty billion, three hundred twenty-four million, thirteen thousand, two hundred fifty-one".