20581616658 has 32 divisors (see below), whose sum is σ = 44727459840. Its totient is φ = 6289796880.

The previous prime is 20581616641. The next prime is 20581616687. The reversal of 20581616658 is 85661618502.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2908410 + ... + 2915477.

It is an arithmetic number, because the mean of its divisors is an integer number (1397733120).

Almost surely, 2^20581616658 is an apocalyptic number.

20581616658 is an abundant number, since it is smaller than the sum of its proper divisors (24145843182).

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

20581616658 is a wasteful number, since it uses less digits than its factorization.

20581616658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5823942.

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 20581616658 in words is "twenty billion, five hundred eighty-one million, six hundred sixteen thousand, six hundred fifty-eight".