19728880 has 20 divisors (see below), whose sum is σ = 45869832. Its totient is φ = 7891520.

The previous prime is 19728853. The next prime is 19728883. The reversal of 19728880 is 8882791.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19728883) 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, 123226 + ... + 123385.

Almost surely, 2^19728880 is an apocalyptic number.

19728880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19728880 is an abundant number, since it is smaller than the sum of its proper divisors (26140952).

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

19728880 is a wasteful number, since it uses less digits than its factorization.

19728880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246624 (or 246618 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 19728880 is about 4441.7203874175. The cubic root of 19728880 is about 270.2096223053.

The spelling of 19728880 in words is "nineteen million, seven hundred twenty-eight thousand, eight hundred eighty".