204380831816 has 96 divisors (see below), whose sum is σ = 449331611040. Its totient is φ = 86896680192.

The previous prime is 204380831803. The next prime is 204380831857. The reversal of 204380831816 is 618138083402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25844135 + ... + 25852041.

It is an arithmetic number, because the mean of its divisors is an integer number (4680537615).

Almost surely, 2^204380831816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204380831816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224665805520).

204380831816 is an abundant number, since it is smaller than the sum of its proper divisors (244950779224).

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

204380831816 is a wasteful number, since it uses less digits than its factorization.

204380831816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8443 (or 8432 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 204380831816 in words is "two hundred four billion, three hundred eighty million, eight hundred thirty-one thousand, eight hundred sixteen".