205087 has 4 divisors (see below), whose sum is σ = 208216. Its totient is φ = 201960.

The previous prime is 205081. The next prime is 205097. The reversal of 205087 is 780502.

205087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 205087 - 2¹¹ = 203039 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 205087.

It is not an unprimeable number, because it can be changed into a prime (205081) 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, 1464 + ... + 1597.

It is an arithmetic number, because the mean of its divisors is an integer number (52054).

2²⁰⁵⁰⁸⁷ is an apocalyptic number.

205087 is a deficient number, since it is larger than the sum of its proper divisors (3129).

205087 is an equidigital number, since it uses as much as digits as its factorization.

205087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3128.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 205087 is about 452.8653221433. The cubic root of 205087 is about 58.9720254243.

Adding to 205087 its reverse (780502), we get a palindrome (985589).

The spelling of 205087 in words is "two hundred five thousand, eighty-seven".