20308503209 has 4 divisors (see below), whose sum is σ = 20318465280. Its totient is φ = 20298541140.

The previous prime is 20308503199. The next prime is 20308503251. The reversal of 20308503209 is 90230580302.

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 20308503209 - 2²⁸ = 20040067753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20308703209) 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 3 ways as a sum of consecutive naturals, for example, 4977977 + ... + 4982054.

It is an arithmetic number, because the mean of its divisors is an integer number (5079616320).

Almost surely, 2^20308503209 is an apocalyptic number.

It is an amenable number.

20308503209 is a deficient number, since it is larger than the sum of its proper divisors (9962071).

20308503209 is an equidigital number, since it uses as much as digits as its factorization.

20308503209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9962070.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 20308503209 in words is "twenty billion, three hundred eight million, five hundred three thousand, two hundred nine".