19880816 has 20 divisors (see below), whose sum is σ = 38600952. Its totient is φ = 9919296.

The previous prime is 19880807. The next prime is 19880851. The reversal of 19880816 is 61808891.

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, 8795 + ... + 10821.

Almost surely, 2^19880816 is an apocalyptic number.

19880816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19880816 is a deficient number, since it is larger than the sum of its proper divisors (18720136).

19880816 is a wasteful number, since it uses less digits than its factorization.

19880816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648 (or 2642 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 19880816 is about 4458.7908674886. The cubic root of 19880816 is about 270.9014951333.

The spelling of 19880816 in words is "nineteen million, eight hundred eighty thousand, eight hundred sixteen".