201820255 has 16 divisors (see below), whose sum is σ = 298073664. Its totient is φ = 127745280.

The previous prime is 201820231. The next prime is 201820259. The reversal of 201820255 is 552028102.

It is not a de Polignac number, because 201820255 - 2⁹ = 201819743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201820259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221326 + ... + 222235.

It is an arithmetic number, because the mean of its divisors is an integer number (18629604).

Almost surely, 2^201820255 is an apocalyptic number.

201820255 is a deficient number, since it is larger than the sum of its proper divisors (96253409).

201820255 is a wasteful number, since it uses less digits than its factorization.

201820255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443586.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 201820255 is about 14206.3455892077. The cubic root of 201820255 is about 586.5723449788.

Adding to 201820255 its reverse (552028102), we get a palindrome (753848357).

The spelling of 201820255 in words is "two hundred one million, eight hundred twenty thousand, two hundred fifty-five".