20331320323 has 4 divisors (see below), whose sum is σ = 21527280360. Its totient is φ = 19135360288.

The previous prime is 20331320309. The next prime is 20331320351. The reversal of 20331320323 is 32302313302.

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

It is a cyclic number.

It is not a de Polignac number, because 20331320323 - 2¹⁷ = 20331189251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20331320294 and 20331320303.

It is not an unprimeable number, because it can be changed into a prime (20331320393) 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, 597979993 + ... + 597980026.

It is an arithmetic number, because the mean of its divisors is an integer number (5381820090).

Almost surely, 2^20331320323 is an apocalyptic number.

20331320323 is a deficient number, since it is larger than the sum of its proper divisors (1195960037).

20331320323 is a wasteful number, since it uses less digits than its factorization.

20331320323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195960036.

The product of its (nonzero) digits is 1944, while the sum is 22.

Adding to 20331320323 its reverse (32302313302), we get a palindrome (52633633625).

The spelling of 20331320323 in words is "twenty billion, three hundred thirty-one million, three hundred twenty thousand, three hundred twenty-three".