19806642706 has 16 divisors (see below), whose sum is σ = 30020140800. Its totient is φ = 9800068608.

The previous prime is 19806642689. The next prime is 19806642719. The reversal of 19806642706 is 60724660891.

It is a self number, because there is not a number n which added to its sum of digits gives 19806642706.

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 7 ways as a sum of consecutive naturals, for example, 256135 + ... + 324373.

It is an arithmetic number, because the mean of its divisors is an integer number (1876258800).

Almost surely, 2^19806642706 is an apocalyptic number.

19806642706 is a deficient number, since it is larger than the sum of its proper divisors (10213498094).

19806642706 is a wasteful number, since it uses less digits than its factorization.

19806642706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69753.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 19806642706 in words is "nineteen billion, eight hundred six million, six hundred forty-two thousand, seven hundred six".