205543430 has 16 divisors (see below), whose sum is σ = 391741920. Its totient is φ = 77380992.

The previous prime is 205543421. The next prime is 205543451. The reversal of 205543430 is 34345502.

It is a self number, because there is not a number n which added to its sum of digits gives 205543430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604370 + ... + 604709.

It is an arithmetic number, because the mean of its divisors is an integer number (24483870).

Almost surely, 2^205543430 is an apocalyptic number.

205543430 is a deficient number, since it is larger than the sum of its proper divisors (186198490).

205543430 is a wasteful number, since it uses less digits than its factorization.

205543430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209103.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 205543430 is about 14336.7859020075. The cubic root of 205543430 is about 590.1574127527.

Adding to 205543430 its reverse (34345502), we get a palindrome (239888932).

The spelling of 205543430 in words is "two hundred five million, five hundred forty-three thousand, four hundred thirty".