205240563 has 36 divisors (see below), whose sum is σ = 327680080. Its totient is φ = 123694560.

The previous prime is 205240561. The next prime is 205240579. The reversal of 205240563 is 365042502.

It is not a de Polignac number, because 205240563 - 2¹ = 205240561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205240561) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 248970 + ... + 249792.

Almost surely, 2^205240563 is an apocalyptic number.

205240563 is a deficient number, since it is larger than the sum of its proper divisors (122439517).

205240563 is a wasteful number, since it uses less digits than its factorization.

205240563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 205240563 is about 14326.2194245377. The cubic root of 205240563 is about 589.8674058064.

The spelling of 205240563 in words is "two hundred five million, two hundred forty thousand, five hundred sixty-three".