20550561255 has 48 divisors (see below), whose sum is σ = 40782343680. Its totient is φ = 9377774784.

The previous prime is 20550561217. The next prime is 20550561259. The reversal of 20550561255 is 55216505502.

20550561255 is a `hidden beast` number, since 2 + 0 + 550 + 56 + 1 + 2 + 55 = 666.

It is not a de Polignac number, because 20550561255 - 2⁸ = 20550560999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550561259) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 119406 + ... + 235284.

It is an arithmetic number, because the mean of its divisors is an integer number (849632160).

Almost surely, 2^20550561255 is an apocalyptic number.

20550561255 is a deficient number, since it is larger than the sum of its proper divisors (20231782425).

20550561255 is a wasteful number, since it uses less digits than its factorization.

20550561255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116460 (or 116457 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 20550561255 in words is "twenty billion, five hundred fifty million, five hundred sixty-one thousand, two hundred fifty-five".