20956705842 has 16 divisors (see below), whose sum is σ = 44119380960. Its totient is φ = 6617907072.

The previous prime is 20956705831. The next prime is 20956705849. The reversal of 20956705842 is 24850765902.

It is a junction number, because it is equal to n+sod(n) for n = 20956705791 and 20956705800.

It is not an unprimeable number, because it can be changed into a prime (20956705849) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 91915263 + ... + 91915490.

It is an arithmetic number, because the mean of its divisors is an integer number (2757461310).

Almost surely, 2^20956705842 is an apocalyptic number.

20956705842 is an abundant number, since it is smaller than the sum of its proper divisors (23162675118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20956705842 is a wasteful number, since it uses less digits than its factorization.

20956705842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183830777.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 20956705842 in words is "twenty billion, nine hundred fifty-six million, seven hundred five thousand, eight hundred forty-two".