205930 has 8 divisors (see below), whose sum is σ = 370692. Its totient is φ = 82368.

The previous prime is 205913. The next prime is 205937. The reversal of 205930 is 39502.

It can be written as a sum of positive squares in 2 ways, for example, as 194481 + 11449 = 441^2 + 107^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 205898 and 205907.

It is not an unprimeable number, because it can be changed into a prime (205937) 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, 10287 + ... + 10306.

2²⁰⁵⁹³⁰ is an apocalyptic number.

205930 is a deficient number, since it is larger than the sum of its proper divisors (164762).

205930 is a wasteful number, since it uses less digits than its factorization.

205930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20600.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 205930 is about 453.7951079507. The cubic root of 205930 is about 59.0527155017.

The spelling of 205930 in words is "two hundred five thousand, nine hundred thirty".