205629 has 4 divisors (see below), whose sum is σ = 274176. Its totient is φ = 137084.

The previous prime is 205627. The next prime is 205633. The reversal of 205629 is 926502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205629 - 2¹ = 205627 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 205599 and 205608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205627) 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, 34269 + ... + 34274.

It is an arithmetic number, because the mean of its divisors is an integer number (68544).

2²⁰⁵⁶²⁹ is an apocalyptic number.

It is an amenable number.

205629 is a deficient number, since it is larger than the sum of its proper divisors (68547).

205629 is an equidigital number, since it uses as much as digits as its factorization.

205629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68546.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 205629 is about 453.4633392017. The cubic root of 205629 is about 59.0239297740.

The spelling of 205629 in words is "two hundred five thousand, six hundred twenty-nine".