204101660 has 72 divisors (see below), whose sum is σ = 527963184. Its totient is φ = 65856000.

The previous prime is 204101659. The next prime is 204101663. The reversal of 204101660 is 66101402.

It is a happy number.

204101660 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×204101660² = 83314975229511200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204101663) 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 23 ways as a sum of consecutive naturals, for example, 10535 + ... + 22785.

It is an arithmetic number, because the mean of its divisors is an integer number (7332822).

Almost surely, 2^204101660 is an apocalyptic number.

204101660 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 204101660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263981592).

204101660 is an abundant number, since it is smaller than the sum of its proper divisors (323861524).

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

204101660 is a wasteful number, since it uses less digits than its factorization.

204101660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12291 (or 12282 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 204101660 is about 14286.4152256611. The cubic root of 204101660 is about 588.7743011623.

The spelling of 204101660 in words is "two hundred four million, one hundred one thousand, six hundred sixty".