205813135 has 24 divisors (see below), whose sum is σ = 287452368. Its totient is φ = 140870400.

The previous prime is 205813133. The next prime is 205813159. The reversal of 205813135 is 531318502.

205813135 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205813135 - 2¹ = 205813133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205813133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 280 + ... + 20290.

It is an arithmetic number, because the mean of its divisors is an integer number (11977182).

Almost surely, 2^205813135 is an apocalyptic number.

205813135 is a deficient number, since it is larger than the sum of its proper divisors (81639233).

205813135 is a wasteful number, since it uses less digits than its factorization.

205813135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20055 (or 20044 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 205813135 is about 14346.1888667339. The cubic root of 205813135 is about 590.4154260881.

It can be divided in two parts, 20581 and 3135, that added together give a square (23716 = 154²).

The spelling of 205813135 in words is "two hundred five million, eight hundred thirteen thousand, one hundred thirty-five".