31320023 has 16 divisors (see below), whose sum is σ = 37289280. Its totient is φ = 25747200.

The previous prime is 31320011. The next prime is 31320041. The reversal of 31320023 is 32002313.

It is a cyclic number.

It is not a de Polignac number, because 31320023 - 2⁴ = 31320007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320053) 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, 16613 + ... + 18401.

It is an arithmetic number, because the mean of its divisors is an integer number (2330580).

Almost surely, 2^31320023 is an apocalyptic number.

31320023 is a deficient number, since it is larger than the sum of its proper divisors (5969257).

31320023 is a wasteful number, since it uses less digits than its factorization.

31320023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 31320023 is about 5596.4294867353. The cubic root of 31320023 is about 315.2153495095.

Adding to 31320023 its reverse (32002313), we get a palindrome (63322336).

The spelling of 31320023 in words is "thirty-one million, three hundred twenty thousand, twenty-three".