20321331013 has 4 divisors (see below), whose sum is σ = 21204867168. Its totient is φ = 19437794860.

The previous prime is 20321330989. The next prime is 20321331049. The reversal of 20321331013 is 31013312302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20321331013 - 2²¹ = 20319233861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321331053) 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, 441768043 + ... + 441768088.

It is an arithmetic number, because the mean of its divisors is an integer number (5301216792).

Almost surely, 2^20321331013 is an apocalyptic number.

20321331013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20321331013 is a deficient number, since it is larger than the sum of its proper divisors (883536155).

20321331013 is an equidigital number, since it uses as much as digits as its factorization.

20321331013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883536154.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 20321331013 its reverse (31013312302), we get a palindrome (51334643315).

The spelling of 20321331013 in words is "twenty billion, three hundred twenty-one million, three hundred thirty-one thousand, thirteen".