20902322009 has 12 divisors (see below), whose sum is σ = 22066241364. Its totient is φ = 19796908032.

The previous prime is 20902322003. The next prime is 20902322033. The reversal of 20902322009 is 90022320902.

It can be written as a sum of positive squares in 2 ways, for example, as 2704312009 + 18198010000 = 52003^2 + 134900^2 .

It is not a de Polignac number, because 20902322009 - 2²⁰ = 20901273433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20902322003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2283089 + ... + 2292225.

It is an arithmetic number, because the mean of its divisors is an integer number (1838853447).

Almost surely, 2^20902322009 is an apocalyptic number.

It is an amenable number.

20902322009 is a deficient number, since it is larger than the sum of its proper divisors (1163919355).

20902322009 is an equidigital number, since it uses as much as digits as its factorization.

20902322009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15512 (or 15493 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 20902322009 in words is "twenty billion, nine hundred two million, three hundred twenty-two thousand, nine".