20668644418 has 16 divisors (see below), whose sum is σ = 31245626880. Its totient is φ = 10253714800.

The previous prime is 20668644397. The next prime is 20668644427. The reversal of 20668644418 is 81444686602.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 79053 + ... + 218143.

It is an arithmetic number, because the mean of its divisors is an integer number (1952851680).

Almost surely, 2^20668644418 is an apocalyptic number.

20668644418 is a deficient number, since it is larger than the sum of its proper divisors (10576982462).

20668644418 is a wasteful number, since it uses less digits than its factorization.

20668644418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139673.

The product of its (nonzero) digits is 1769472, while the sum is 49.

The spelling of 20668644418 in words is "twenty billion, six hundred sixty-eight million, six hundred forty-four thousand, four hundred eighteen".