19922816 has 32 divisors (see below), whose sum is σ = 39896280. Its totient is φ = 9909760.

The previous prime is 19922779. The next prime is 19922821. The reversal of 19922816 is 61822991.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 19922816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40331 + ... + 40821.

Almost surely, 2^19922816 is an apocalyptic number.

19922816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19922816 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

19922816 is an equidigital number, since it uses as much as digits as its factorization.

19922816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 810 counting only the distinct ones).

The product of its digits is 15552, while the sum is 38.

The square root of 19922816 is about 4463.4981796793. The cubic root of 19922816 is about 271.0921288231.

The spelling of 19922816 in words is "nineteen million, nine hundred twenty-two thousand, eight hundred sixteen".