20131203233 has 4 divisors (see below), whose sum is σ = 20309355588. Its totient is φ = 19953050880.

The previous prime is 20131203229. The next prime is 20131203263. The reversal of 20131203233 is 33230213102.

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 10349399824 + 9781803409 = 101732^2 + 98903^2 .

It is a cyclic number.

It is not a de Polignac number, because 20131203233 - 2² = 20131203229 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131203223) 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, 89076008 + ... + 89076233.

It is an arithmetic number, because the mean of its divisors is an integer number (5077338897).

Almost surely, 2^20131203233 is an apocalyptic number.

It is an amenable number.

20131203233 is a deficient number, since it is larger than the sum of its proper divisors (178152355).

20131203233 is a wasteful number, since it uses less digits than its factorization.

20131203233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178152354.

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

Adding to 20131203233 its reverse (33230213102), we get a palindrome (53361416335).

The spelling of 20131203233 in words is "twenty billion, one hundred thirty-one million, two hundred three thousand, two hundred thirty-three".