20311321331 has 16 divisors (see below), whose sum is σ = 23928431616. Its totient is φ = 16880009856.

The previous prime is 20311321301. The next prime is 20311321333. The reversal of 20311321331 is 13312311302.

It is a cyclic number.

It is not a de Polignac number, because 20311321331 - 2³⁰ = 19237579507 is a prime.

It is a super-2 number, since 2×20311321331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20311321333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253286 + ... + 323691.

It is an arithmetic number, because the mean of its divisors is an integer number (1495526976).

Almost surely, 2^20311321331 is an apocalyptic number.

20311321331 is a deficient number, since it is larger than the sum of its proper divisors (3617110285).

20311321331 is a wasteful number, since it uses less digits than its factorization.

20311321331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577138.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 20311321331 its reverse (13312311302), we get a palindrome (33623632633).

The spelling of 20311321331 in words is "twenty billion, three hundred eleven million, three hundred twenty-one thousand, three hundred thirty-one".