205645430 has 32 divisors (see below), whose sum is σ = 392942016. Its totient is φ = 77220864.

The previous prime is 205645411. The next prime is 205645439. The reversal of 205645430 is 34546502.

205645430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 205645393 and 205645402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205645439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76367 + ... + 79013.

It is an arithmetic number, because the mean of its divisors is an integer number (12279438).

Almost surely, 2^205645430 is an apocalyptic number.

205645430 is a deficient number, since it is larger than the sum of its proper divisors (187296586).

205645430 is a wasteful number, since it uses less digits than its factorization.

205645430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 205645430 is about 14340.3427434633. The cubic root of 205645430 is about 590.2550175939.

The spelling of 205645430 in words is "two hundred five million, six hundred forty-five thousand, four hundred thirty".