20256817255 has 16 divisors (see below), whose sum is σ = 25410677184. Its totient is φ = 15472990720.

The previous prime is 20256817223. The next prime is 20256817261. The reversal of 20256817255 is 55271865202.

It is not a de Polignac number, because 20256817255 - 2⁵ = 20256817223 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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94066 + ... + 222175.

It is an arithmetic number, because the mean of its divisors is an integer number (1588167324).

Almost surely, 2^20256817255 is an apocalyptic number.

20256817255 is a deficient number, since it is larger than the sum of its proper divisors (5153859929).

20256817255 is a wasteful number, since it uses less digits than its factorization.

20256817255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316826.

The product of its (nonzero) digits is 336000, while the sum is 43.

The spelling of 20256817255 in words is "twenty billion, two hundred fifty-six million, eight hundred seventeen thousand, two hundred fifty-five".