205430830 has 16 divisors (see below), whose sum is σ = 403391664. Its totient is φ = 74702080.

The previous prime is 205430801. The next prime is 205430851. The reversal of 205430830 is 38034502.

It is a junction number, because it is equal to n+sod(n) for n = 205430795 and 205430804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 933667 + ... + 933886.

It is an arithmetic number, because the mean of its divisors is an integer number (25211979).

Almost surely, 2^205430830 is an apocalyptic number.

205430830 is a deficient number, since it is larger than the sum of its proper divisors (197960834).

205430830 is a wasteful number, since it uses less digits than its factorization.

205430830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867571.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 205430830 is about 14332.8584029844. The cubic root of 205430830 is about 590.0496271575.

The spelling of 205430830 in words is "two hundred five million, four hundred thirty thousand, eight hundred thirty".