20312331 has 16 divisors (see below), whose sum is σ = 30883104. Its totient is φ = 11764224.

The previous prime is 20312309. The next prime is 20312351. The reversal of 20312331 is 13321302.

It is not a de Polignac number, because 20312331 - 2¹⁰ = 20311307 is a prime.

It is a super-2 number, since 2×20312331² = 825181581307122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20312331.

It is not an unprimeable number, because it can be changed into a prime (20312351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14656 + ... + 15981.

It is an arithmetic number, because the mean of its divisors is an integer number (1930194).

Almost surely, 2^20312331 is an apocalyptic number.

20312331 is a deficient number, since it is larger than the sum of its proper divisors (10570773).

20312331 is a wasteful number, since it uses less digits than its factorization.

20312331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30670.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 20312331 is about 4506.9203454244. The cubic root of 20312331 is about 272.8474640641.

Adding to 20312331 its reverse (13321302), we get a palindrome (33633633).

The spelling of 20312331 in words is "twenty million, three hundred twelve thousand, three hundred thirty-one".