205470565 has 4 divisors (see below), whose sum is σ = 246564684. Its totient is φ = 164376448.

The previous prime is 205470527. The next prime is 205470581. The reversal of 205470565 is 565074502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 565074502 = 2 ⋅282537251.

It can be written as a sum of positive squares in 2 ways, for example, as 58721569 + 146748996 = 7663^2 + 12114^2 .

It is a cyclic number.

It is not a de Polignac number, because 205470565 - 2⁷ = 205470437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205470565.

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 3 ways as a sum of consecutive naturals, for example, 20547052 + ... + 20547061.

It is an arithmetic number, because the mean of its divisors is an integer number (61641171).

Almost surely, 2^205470565 is an apocalyptic number.

It is an amenable number.

205470565 is a deficient number, since it is larger than the sum of its proper divisors (41094119).

205470565 is an equidigital number, since it uses as much as digits as its factorization.

205470565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41094118.

The product of its (nonzero) digits is 42000, while the sum is 34.

The square root of 205470565 is about 14334.2444865434. The cubic root of 205470565 is about 590.0876677159.

The spelling of 205470565 in words is "two hundred five million, four hundred seventy thousand, five hundred sixty-five".