20312031233 has 4 divisors (see below), whose sum is σ = 21874495188. Its totient is φ = 18749567280.

The previous prime is 20312031197. The next prime is 20312031241. The reversal of 20312031233 is 33213021302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12825109504 + 7486921729 = 113248^2 + 86527^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312031233 - 2¹⁶ = 20311965697 is a prime.

It is a super-2 number, since 2×20312031233² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20312031253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781231958 + ... + 781231983.

It is an arithmetic number, because the mean of its divisors is an integer number (5468623797).

Almost surely, 2^20312031233 is an apocalyptic number.

It is an amenable number.

20312031233 is a deficient number, since it is larger than the sum of its proper divisors (1562463955).

20312031233 is a wasteful number, since it uses less digits than its factorization.

20312031233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562463954.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 20312031233 its reverse (33213021302), we get a palindrome (53525052535).

The spelling of 20312031233 in words is "twenty billion, three hundred twelve million, thirty-one thousand, two hundred thirty-three".