205805465 has 4 divisors (see below), whose sum is σ = 246966564. Its totient is φ = 164644368.

The previous prime is 205805459. The next prime is 205805503. The reversal of 205805465 is 564508502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42042256 + 163763209 = 6484^2 + 12797^2 .

It is a cyclic number.

It is not a de Polignac number, because 205805465 - 2⁶ = 205805401 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20580542 + ... + 20580551.

It is an arithmetic number, because the mean of its divisors is an integer number (61741641).

Almost surely, 2^205805465 is an apocalyptic number.

It is an amenable number.

205805465 is a deficient number, since it is larger than the sum of its proper divisors (41161099).

205805465 is an equidigital number, since it uses as much as digits as its factorization.

205805465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41161098.

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 205805465 is about 14345.9215458610. The cubic root of 205805465 is about 590.4080916962.

The spelling of 205805465 in words is "two hundred five million, eight hundred five thousand, four hundred sixty-five".