19903812 has 24 divisors (see below), whose sum is σ = 47205312. Its totient is φ = 6525600.

The previous prime is 19903799. The next prime is 19903837. The reversal of 19903812 is 21830991.

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, 12864 + ... + 14327.

It is an arithmetic number, because the mean of its divisors is an integer number (1966888).

Almost surely, 2^19903812 is an apocalyptic number.

19903812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19903812 is an abundant number, since it is smaller than the sum of its proper divisors (27301500).

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

19903812 is a wasteful number, since it uses less digits than its factorization.

19903812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27259 (or 27257 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 19903812 is about 4461.3688482348. The cubic root of 19903812 is about 271.0059048381.

The spelling of 19903812 in words is "nineteen million, nine hundred three thousand, eight hundred twelve".