20947567782 has 16 divisors (see below), whose sum is σ = 41921192880. Its totient is φ = 6978179712.

The previous prime is 20947567769. The next prime is 20947567787. The reversal of 20947567782 is 28776574902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20947567787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1075263 + ... + 1094570.

It is an arithmetic number, because the mean of its divisors is an integer number (2620074555).

Almost surely, 2^20947567782 is an apocalyptic number.

20947567782 is an abundant number, since it is smaller than the sum of its proper divisors (20973625098).

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

20947567782 is a wasteful number, since it uses less digits than its factorization.

20947567782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171447.

The product of its (nonzero) digits is 11854080, while the sum is 57.

The spelling of 20947567782 in words is "twenty billion, nine hundred forty-seven million, five hundred sixty-seven thousand, seven hundred eighty-two".