205538 has 4 divisors (see below), whose sum is σ = 308310. Its totient is φ = 102768.

The previous prime is 205537. The next prime is 205549. The reversal of 205538 is 835502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 835502 = 2 ⋅417751.

It can be written as a sum of positive squares in only one way, i.e., 170569 + 34969 = 413^2 + 187^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 205538.

It is not an unprimeable number, because it can be changed into a prime (205537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51383 + ... + 51386.

2²⁰⁵⁵³⁸ is an apocalyptic number.

205538 is a deficient number, since it is larger than the sum of its proper divisors (102772).

205538 is a wasteful number, since it uses less digits than its factorization.

205538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102771.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 205538 is about 453.3629892261. The cubic root of 205538 is about 59.0152215825.

The spelling of 205538 in words is "two hundred five thousand, five hundred thirty-eight".