204156918 has 48 divisors (see below), whose sum is σ = 510471936. Its totient is φ = 57760560.

The previous prime is 204156899. The next prime is 204156949. The reversal of 204156918 is 819651402.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 23 ways as a sum of consecutive naturals, for example, 5113 + ... + 20843.

It is an arithmetic number, because the mean of its divisors is an integer number (10634832).

Almost surely, 2^204156918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204156918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255235968).

204156918 is an abundant number, since it is smaller than the sum of its proper divisors (306315018).

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

204156918 is a wasteful number, since it uses less digits than its factorization.

204156918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15849 (or 15846 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 204156918 is about 14288.3490298915. The cubic root of 204156918 is about 588.8274308211.

The spelling of 204156918 in words is "two hundred four million, one hundred fifty-six thousand, nine hundred eighteen".