20331213233 has 4 divisors (see below), whose sum is σ = 20511135588. Its totient is φ = 20151290880.

The previous prime is 20331213163. The next prime is 20331213247. The reversal of 20331213233 is 33231213302.

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 10753067809 + 9578145424 = 103697^2 + 97868^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331213233 - 2⁸ = 20331212977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20331213199 and 20331213208.

It is not an unprimeable number, because it can be changed into a prime (20331216233) 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, 89961008 + ... + 89961233.

It is an arithmetic number, because the mean of its divisors is an integer number (5127783897).

Almost surely, 2^20331213233 is an apocalyptic number.

It is an amenable number.

20331213233 is a deficient number, since it is larger than the sum of its proper divisors (179922355).

20331213233 is a wasteful number, since it uses less digits than its factorization.

20331213233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179922354.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 20331213233 its reverse (33231213302), we get a palindrome (53562426535).

The spelling of 20331213233 in words is "twenty billion, three hundred thirty-one million, two hundred thirteen thousand, two hundred thirty-three".