205442 has 8 divisors (see below), whose sum is σ = 310800. Its totient is φ = 101844.

The previous prime is 205441. The next prime is 205453. The reversal of 205442 is 244502.

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

It is a self number, because there is not a number n which added to its sum of digits gives 205442.

It is not an unprimeable number, because it can be changed into a prime (205441) 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, 92 + ... + 647.

It is an arithmetic number, because the mean of its divisors is an integer number (38850).

2²⁰⁵⁴⁴² is an apocalyptic number.

205442 is a deficient number, since it is larger than the sum of its proper divisors (105358).

205442 is a wasteful number, since it uses less digits than its factorization.

205442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 205442 is about 453.2571014336. The cubic root of 205442 is about 59.0060321325.

Adding to 205442 its reverse (244502), we get a palindrome (449944).

Subtracting 205442 from its reverse (244502), we obtain a triangular number (39060 = T₂₇₉).

It can be divided in two parts, 2054 and 42, that multiplied together give a palindrome (86268).

The spelling of 205442 in words is "two hundred five thousand, four hundred forty-two".