20569285441 has 4 divisors (see below), whose sum is σ = 20682928084. Its totient is φ = 20455642800.

The previous prime is 20569285397. The next prime is 20569285453. The reversal of 20569285441 is 14458296502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10460993841 + 10108291600 = 102279^2 + 100540^2 .

It is a cyclic number.

It is not a de Polignac number, because 20569285441 - 2¹¹ = 20569283393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20569285391 and 20569285400.

It is not an unprimeable number, because it can be changed into a prime (20569285141) 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 3 ways as a sum of consecutive naturals, for example, 56821050 + ... + 56821411.

It is an arithmetic number, because the mean of its divisors is an integer number (5170732021).

Almost surely, 2^20569285441 is an apocalyptic number.

It is an amenable number.

20569285441 is a deficient number, since it is larger than the sum of its proper divisors (113642643).

20569285441 is a wasteful number, since it uses less digits than its factorization.

20569285441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113642642.

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 20569285441 in words is "twenty billion, five hundred sixty-nine million, two hundred eighty-five thousand, four hundred forty-one".