20956232805 has 16 divisors (see below), whose sum is σ = 33591963264. Its totient is φ = 11155993920.

The previous prime is 20956232783. The next prime is 20956232831. The reversal of 20956232805 is 50823265902.

It is not a de Polignac number, because 20956232805 - 2⁹ = 20956232293 is a prime.

It is a Curzon 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, 1283089 + ... + 1299318.

It is an arithmetic number, because the mean of its divisors is an integer number (2099497704).

Almost surely, 2^20956232805 is an apocalyptic number.

It is an amenable number.

20956232805 is a deficient number, since it is larger than the sum of its proper divisors (12635730459).

20956232805 is a wasteful number, since it uses less digits than its factorization.

20956232805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2582956.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 20956232805 in words is "twenty billion, nine hundred fifty-six million, two hundred thirty-two thousand, eight hundred five".