205430730 has 16 divisors (see below), whose sum is σ = 493033824. Its totient is φ = 54781520.

The previous prime is 205430713. The next prime is 205430783. The reversal of 205430730 is 37034502.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 205430730.

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 7 ways as a sum of consecutive naturals, for example, 3423816 + ... + 3423875.

It is an arithmetic number, because the mean of its divisors is an integer number (30814614).

Almost surely, 2^205430730 is an apocalyptic number.

205430730 is an abundant number, since it is smaller than the sum of its proper divisors (287603094).

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

205430730 is a wasteful number, since it uses less digits than its factorization.

205430730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6847701.

The product of its (nonzero) digits is 2520, while the sum is 24.

The square root of 205430730 is about 14332.8549144963. The cubic root of 205430730 is about 590.0495314157.

The spelling of 205430730 in words is "two hundred five million, four hundred thirty thousand, seven hundred thirty".