19912027806 has 24 divisors (see below), whose sum is σ = 47064793464. Its totient is φ = 6033947760.

The previous prime is 19912027799. The next prime is 19912027831. The reversal of 19912027806 is 60872021991.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 50282701 + ... + 50283096.

It is an arithmetic number, because the mean of its divisors is an integer number (1961033061).

Almost surely, 2^19912027806 is an apocalyptic number.

19912027806 is an abundant number, since it is smaller than the sum of its proper divisors (27152765658).

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

19912027806 is a wasteful number, since it uses less digits than its factorization.

19912027806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100565816 (or 100565813 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 19912027806 in words is "nineteen billion, nine hundred twelve million, twenty-seven thousand, eight hundred six".