204308390015 has 4 divisors (see below), whose sum is σ = 245170068024. Its totient is φ = 163446712008.

The previous prime is 204308390003. The next prime is 204308390051. The reversal of 204308390015 is 510093803402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204308390015 - 2³⁰ = 203234648191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20430838997 + ... + 20430839006.

It is an arithmetic number, because the mean of its divisors is an integer number (61292517006).

Almost surely, 2^204308390015 is an apocalyptic number.

204308390015 is a deficient number, since it is larger than the sum of its proper divisors (40861678009).

204308390015 is an equidigital number, since it uses as much as digits as its factorization.

204308390015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40861678008.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 204308390015 in words is "two hundred four billion, three hundred eight million, three hundred ninety thousand, fifteen".