20290841568 has 72 divisors (see below), whose sum is σ = 59691832200. Its totient is φ = 6530383104.

The previous prime is 20290841563. The next prime is 20290841579. The reversal of 20290841568 is 86514809202.

20290841568 is a `hidden beast` number, since 2 + 0 + 2 + 9 + 0 + 84 + 1 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20290841561) 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 11 ways as a sum of consecutive naturals, for example, 1206378 + ... + 1223081.

It is an arithmetic number, because the mean of its divisors is an integer number (829053225).

Almost surely, 2^20290841568 is an apocalyptic number.

It is an amenable number.

20290841568 is an abundant number, since it is smaller than the sum of its proper divisors (39400990632).

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

20290841568 is a wasteful number, since it uses less digits than its factorization.

20290841568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429504 (or 2429493 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 20290841568 in words is "twenty billion, two hundred ninety million, eight hundred forty-one thousand, five hundred sixty-eight".