205581023 has 4 divisors (see below), whose sum is σ = 205623120. Its totient is φ = 205538928.

The previous prime is 205580959. The next prime is 205581031. The reversal of 205581023 is 320185502.

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

It is a cyclic number.

It is not a de Polignac number, because 205581023 - 2⁶ = 205580959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205580983 and 205581001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205581043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12590 + ... + 23867.

It is an arithmetic number, because the mean of its divisors is an integer number (51405780).

Almost surely, 2^205581023 is an apocalyptic number.

205581023 is a deficient number, since it is larger than the sum of its proper divisors (42097).

205581023 is an equidigital number, since it uses as much as digits as its factorization.

205581023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42096.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 205581023 is about 14338.0969099808. The cubic root of 205581023 is about 590.1933896347.

The spelling of 205581023 in words is "two hundred five million, five hundred eighty-one thousand, twenty-three".