20811860177255 has 32 divisors (see below), whose sum is σ = 28987386776064. Its totient is φ = 14048571689856.

The previous prime is 20811860177237. The next prime is 20811860177291. The reversal of 20811860177255 is 55277106811802.

It is a cyclic number.

It is not a de Polignac number, because 20811860177255 - 2²⁰ = 20811859128679 is a prime.

It is a super-2 number, since 2×20811860177255² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20811860177197 and 20811860177206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 528884 + ... + 6473286.

It is an arithmetic number, because the mean of its divisors is an integer number (905855836752).

Almost surely, 2^{20811860177255} is an apocalyptic number.

20811860177255 is a deficient number, since it is larger than the sum of its proper divisors (8175526598809).

20811860177255 is a wasteful number, since it uses less digits than its factorization.

20811860177255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5945975.

The product of its (nonzero) digits is 1881600, while the sum is 53.

The spelling of 20811860177255 in words is "twenty trillion, eight hundred eleven billion, eight hundred sixty million, one hundred seventy-seven thousand, two hundred fifty-five".