205455 has 8 divisors (see below), whose sum is σ = 328752. Its totient is φ = 109568.

The previous prime is 205453. The next prime is 205463. The reversal of 205455 is 554502.

205455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 205455 - 2¹ = 205453 is a prime.

205455 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6834 + ... + 6863.

It is an arithmetic number, because the mean of its divisors is an integer number (41094).

2²⁰⁵⁴⁵⁵ is an apocalyptic number.

205455 is a deficient number, since it is larger than the sum of its proper divisors (123297).

205455 is a wasteful number, since it uses less digits than its factorization.

205455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13705.

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 205455 is about 453.2714418536. The cubic root of 205455 is about 59.0072767047.

Adding to 205455 its reverse (554502), we get a palindrome (759957).

The spelling of 205455 in words is "two hundred five thousand, four hundred fifty-five".