205712345 has 16 divisors (see below), whose sum is σ = 262455552. Its totient is φ = 154440000.

The previous prime is 205712333. The next prime is 205712363. The reversal of 205712345 is 543217502.

It is a happy number.

It is not a de Polignac number, because 205712345 - 2⁶ = 205712281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10781 + ... + 22970.

It is an arithmetic number, because the mean of its divisors is an integer number (16403472).

Almost surely, 2^205712345 is an apocalyptic number.

It is an amenable number.

205712345 is a deficient number, since it is larger than the sum of its proper divisors (56743207).

205712345 is a wasteful number, since it uses less digits than its factorization.

205712345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33832.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 205712345 is about 14342.6756569338. The cubic root of 205712345 is about 590.3190317100.

Adding to 205712345 its reverse (543217502), we get a palindrome (748929847).

The spelling of 205712345 in words is "two hundred five million, seven hundred twelve thousand, three hundred forty-five".