20311011323 has 4 divisors (see below), whose sum is σ = 20424480840. Its totient is φ = 20197541808.

The previous prime is 20311011317. The next prime is 20311011377. The reversal of 20311011323 is 32311011302.

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-20311011323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20311011223) 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, 56734490 + ... + 56734847.

It is an arithmetic number, because the mean of its divisors is an integer number (5106120210).

Almost surely, 2^20311011323 is an apocalyptic number.

20311011323 is a deficient number, since it is larger than the sum of its proper divisors (113469517).

20311011323 is a wasteful number, since it uses less digits than its factorization.

20311011323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113469516.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20311011323 its reverse (32311011302), we get a palindrome (52622022625).

The spelling of 20311011323 in words is "twenty billion, three hundred eleven million, eleven thousand, three hundred twenty-three".