20565550263 has 8 divisors (see below), whose sum is σ = 27445825648. Its totient is φ = 13697820864.

The previous prime is 20565550193. The next prime is 20565550289. The reversal of 20565550263 is 36205556502.

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

It is not a de Polignac number, because 20565550263 - 2²⁶ = 20498441399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20565550363) 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 7 ways as a sum of consecutive naturals, for example, 3132670 + ... + 3139227.

It is an arithmetic number, because the mean of its divisors is an integer number (3430728206).

Almost surely, 2^20565550263 is an apocalyptic number.

20565550263 is a deficient number, since it is larger than the sum of its proper divisors (6880275385).

20565550263 is a wasteful number, since it uses less digits than its factorization.

20565550263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6272993.

The product of its (nonzero) digits is 270000, while the sum is 39.

The spelling of 20565550263 in words is "twenty billion, five hundred sixty-five million, five hundred fifty thousand, two hundred sixty-three".