205012605 has 64 divisors (see below), whose sum is σ = 406315008. Its totient is φ = 86123520.

The previous prime is 205012601. The next prime is 205012607. The reversal of 205012605 is 506210502.

It is not a de Polignac number, because 205012605 - 2² = 205012601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205012601) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 75420 + ... + 78090.

It is an arithmetic number, because the mean of its divisors is an integer number (6348672).

Almost surely, 2^205012605 is an apocalyptic number.

It is an amenable number.

205012605 is a deficient number, since it is larger than the sum of its proper divisors (201302403).

205012605 is a wasteful number, since it uses less digits than its factorization.

205012605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 205012605 is about 14318.2612422040. The cubic root of 205012605 is about 589.6489389080.

The spelling of 205012605 in words is "two hundred five million, twelve thousand, six hundred five".