19805912 has 16 divisors (see below), whose sum is σ = 42441360. Its totient is φ = 8488224.

The previous prime is 19805909. The next prime is 19805917. The reversal of 19805912 is 21950891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19805917) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 176783 + ... + 176894.

It is an arithmetic number, because the mean of its divisors is an integer number (2652585).

Almost surely, 2^19805912 is an apocalyptic number.

It is an amenable number.

19805912 is an abundant number, since it is smaller than the sum of its proper divisors (22635448).

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

19805912 is a wasteful number, since it uses less digits than its factorization.

19805912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353690 (or 353686 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 19805912 is about 4450.3833542741. The cubic root of 19805912 is about 270.5608460880.

The spelling of 19805912 in words is "nineteen million, eight hundred five thousand, nine hundred twelve".