205900215 has 16 divisors (see below), whose sum is σ = 329893728. Its totient is φ = 109662336.

The previous prime is 205900199. The next prime is 205900231. The reversal of 205900215 is 512009502.

It is an interprime number because it is at equal distance from previous prime (205900199) and next prime (205900231).

It is not a de Polignac number, because 205900215 - 2⁴ = 205900199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2289 + ... + 20421.

It is an arithmetic number, because the mean of its divisors is an integer number (20618358).

Almost surely, 2^205900215 is an apocalyptic number.

205900215 is a deficient number, since it is larger than the sum of its proper divisors (123993513).

205900215 is a wasteful number, since it uses less digits than its factorization.

205900215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18898.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 205900215 is about 14349.2234981549. The cubic root of 205900215 is about 590.4986830450.

Adding to 205900215 its reverse (512009502), we get a palindrome (717909717).

The spelling of 205900215 in words is "two hundred five million, nine hundred thousand, two hundred fifteen".