205450645 has 16 divisors (see below), whose sum is σ = 255519360. Its totient is φ = 158396224.

The previous prime is 205450601. The next prime is 205450657. The reversal of 205450645 is 546054502.

It is a cyclic number.

It is not a de Polignac number, because 205450645 - 2¹¹ = 205448597 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 106782 + ... + 108688.

It is an arithmetic number, because the mean of its divisors is an integer number (15969960).

Almost surely, 2^205450645 is an apocalyptic number.

It is an amenable number.

205450645 is a deficient number, since it is larger than the sum of its proper divisors (50068715).

205450645 is a wasteful number, since it uses less digits than its factorization.

205450645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 205450645 is about 14333.5496301509. The cubic root of 205450645 is about 590.0685977886.

The spelling of 205450645 in words is "two hundred five million, four hundred fifty thousand, six hundred forty-five".