204216660 has 48 divisors (see below), whose sum is σ = 635342400. Its totient is φ = 54457632.

The previous prime is 204216643. The next prime is 204216667. The reversal of 204216660 is 66612402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204216667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188550 + ... + 189629.

It is an arithmetic number, because the mean of its divisors is an integer number (13236300).

Almost surely, 2^204216660 is an apocalyptic number.

204216660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204216660 is an abundant number, since it is smaller than the sum of its proper divisors (431125740).

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

204216660 is a wasteful number, since it uses less digits than its factorization.

204216660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378197 (or 378189 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 204216660 is about 14290.4394614022. The cubic root of 204216660 is about 588.8848609880.

The spelling of 204216660 in words is "two hundred four million, two hundred sixteen thousand, six hundred sixty".