205660030 has 16 divisors (see below), whose sum is σ = 370569024. Its totient is φ = 82179360.

The previous prime is 205660027. The next prime is 205660031. The reversal of 205660030 is 30066502.

It is a junction number, because it is equal to n+sod(n) for n = 205659983 and 205660010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205660031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139 + ... + 20281.

It is an arithmetic number, because the mean of its divisors is an integer number (23160564).

Almost surely, 2^205660030 is an apocalyptic number.

205660030 is a deficient number, since it is larger than the sum of its proper divisors (164908994).

205660030 is a wasteful number, since it uses less digits than its factorization.

205660030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21171.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 205660030 is about 14340.8517878123. The cubic root of 205660030 is about 590.2689858422.

The spelling of 205660030 in words is "two hundred five million, six hundred sixty thousand, thirty".