255820 has 12 divisors (see below), whose sum is σ = 537264. Its totient is φ = 102320.

The previous prime is 255803. The next prime is 255839. The reversal of 255820 is 28552.

255820 is nontrivially palindromic in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 255791 and 255800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6376 + ... + 6415.

It is an arithmetic number, because the mean of its divisors is an integer number (44772).

2²⁵⁵⁸²⁰ is an apocalyptic number.

255820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255820 is an abundant number, since it is smaller than the sum of its proper divisors (281444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255820 is a wasteful number, since it uses less digits than its factorization.

255820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12800 (or 12798 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 255820 is about 505.7865162299. The cubic root of 255820 is about 63.4811567046.

The spelling of 255820 in words is "two hundred fifty-five thousand, eight hundred twenty".