19982816 has 24 divisors (see below), whose sum is σ = 44961840. Its totient is φ = 8563968.

The previous prime is 19982797. The next prime is 19982819. The reversal of 19982816 is 61828991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19982819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44381 + ... + 44828.

It is an arithmetic number, because the mean of its divisors is an integer number (1873410).

Almost surely, 2^19982816 is an apocalyptic number.

19982816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19982816 is an abundant number, since it is smaller than the sum of its proper divisors (24979024).

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

19982816 is an equidigital number, since it uses as much as digits as its factorization.

19982816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89226 (or 89218 counting only the distinct ones).

The product of its digits is 62208, while the sum is 44.

The square root of 19982816 is about 4470.2143125358. The cubic root of 19982816 is about 271.3639984633.

The spelling of 19982816 in words is "nineteen million, nine hundred eighty-two thousand, eight hundred sixteen".