205930634 has 24 divisors (see below), whose sum is σ = 386970948. Its totient is φ = 81466560.

The previous prime is 205930633. The next prime is 205930679. The reversal of 205930634 is 436039502.

It can be written as a sum of positive squares in 2 ways, for example, as 191905609 + 14025025 = 13853^2 + 3745^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 205930634.

It is not an unprimeable number, because it can be changed into a prime (205930633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79547 + ... + 82094.

Almost surely, 2^205930634 is an apocalyptic number.

205930634 is a deficient number, since it is larger than the sum of its proper divisors (181040314).

205930634 is a wasteful number, since it uses less digits than its factorization.

205930634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161670 (or 161663 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 205930634 is about 14350.2834118355. The cubic root of 205930634 is about 590.5277610379.

The spelling of 205930634 in words is "two hundred five million, nine hundred thirty thousand, six hundred thirty-four".