15205820838 has 16 divisors (see below), whose sum is σ = 32750998896. Its totient is φ = 4678714080.

The previous prime is 15205820809. The next prime is 15205820899. The reversal of 15205820838 is 83802850251.

15205820838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15205820838.

It is a congruent 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, 97473133 + ... + 97473288.

It is an arithmetic number, because the mean of its divisors is an integer number (2046937431).

Almost surely, 2^15205820838 is an apocalyptic number.

15205820838 is an abundant number, since it is smaller than the sum of its proper divisors (17545178058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15205820838 is a wasteful number, since it uses less digits than its factorization.

15205820838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194946439.

The product of its (nonzero) digits is 153600, while the sum is 42.

The spelling of 15205820838 in words is "fifteen billion, two hundred five million, eight hundred twenty thousand, eight hundred thirty-eight".