205420255 has 8 divisors (see below), whose sum is σ = 247251024. Its totient is φ = 163838400.

The previous prime is 205420247. The next prime is 205420289. The reversal of 205420255 is 552024502.

It is a happy number.

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

It is not a de Polignac number, because 205420255 - 2³ = 205420247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60406 + ... + 63715.

It is an arithmetic number, because the mean of its divisors is an integer number (30906378).

Almost surely, 2^205420255 is an apocalyptic number.

205420255 is a deficient number, since it is larger than the sum of its proper divisors (41830769).

205420255 is a wasteful number, since it uses less digits than its factorization.

205420255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124457.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 205420255 is about 14332.4894906642. The cubic root of 205420255 is about 590.0395022867.

Adding to 205420255 its reverse (552024502), we get a palindrome (757444757).

The spelling of 205420255 in words is "two hundred five million, four hundred twenty thousand, two hundred fifty-five".