20031311323 has 4 divisors (see below), whose sum is σ = 20677482688. Its totient is φ = 19385139960.

The previous prime is 20031311303. The next prime is 20031311351. The reversal of 20031311323 is 32311313002.

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

It is a cyclic number.

It is not a de Polignac number, because 20031311323 - 2⁵ = 20031311291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20031311323.

It is not an unprimeable number, because it can be changed into a prime (20031311303) 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, 323085636 + ... + 323085697.

It is an arithmetic number, because the mean of its divisors is an integer number (5169370672).

Almost surely, 2^20031311323 is an apocalyptic number.

20031311323 is a deficient number, since it is larger than the sum of its proper divisors (646171365).

20031311323 is an equidigital number, since it uses as much as digits as its factorization.

20031311323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646171364.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 20031311323 its reverse (32311313002), we get a palindrome (52342624325).

The spelling of 20031311323 in words is "twenty billion, thirty-one million, three hundred eleven thousand, three hundred twenty-three".