204861660 has 48 divisors (see below), whose sum is σ = 577159296. Its totient is φ = 54292032.

The previous prime is 204861659. The next prime is 204861691. The reversal of 204861660 is 66168402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 694 + ... + 20253.

It is an arithmetic number, because the mean of its divisors is an integer number (12024152).

Almost surely, 2^204861660 is an apocalyptic number.

204861660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204861660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288579648).

204861660 is an abundant number, since it is smaller than the sum of its proper divisors (372297636).

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

204861660 is a wasteful number, since it uses less digits than its factorization.

204861660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21122 (or 21120 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 204861660 is about 14312.9892056132. The cubic root of 204861660 is about 589.5041894150.

The spelling of 204861660 in words is "two hundred four million, eight hundred sixty-one thousand, six hundred sixty".