20309388890 has 16 divisors (see below), whose sum is σ = 41779314432. Its totient is φ = 6963219024.

The previous prime is 20309388881. The next prime is 20309388919. The reversal of 20309388890 is 9888390302.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145066994 + ... + 145067133.

It is an arithmetic number, because the mean of its divisors is an integer number (2611207152).

Almost surely, 2^20309388890 is an apocalyptic number.

20309388890 is an abundant number, since it is smaller than the sum of its proper divisors (21469925542).

20309388890 is a wasteful number, since it uses less digits than its factorization.

20309388890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290134141.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 20309388890 in words is "twenty billion, three hundred nine million, three hundred eighty-eight thousand, eight hundred ninety".