205742 has 4 divisors (see below), whose sum is σ = 308616. Its totient is φ = 102870.

The previous prime is 205721. The next prime is 205759. The reversal of 205742 is 247502.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51434 + ... + 51437.

It is an arithmetic number, because the mean of its divisors is an integer number (77154).

2²⁰⁵⁷⁴² is an apocalyptic number.

205742 is a deficient number, since it is larger than the sum of its proper divisors (102874).

205742 is a wasteful number, since it uses less digits than its factorization.

205742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102873.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 205742 is about 453.5879187104. The cubic root of 205742 is about 59.0347396674.

The spelling of 205742 in words is "two hundred five thousand, seven hundred forty-two".