19728916 has 24 divisors (see below), whose sum is σ = 37194080. Its totient is φ = 9126432.

The previous prime is 19728911. The next prime is 19728949. The reversal of 19728916 is 61982791.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19728911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250 + ... + 6286.

Almost surely, 2^19728916 is an apocalyptic number.

It is an amenable number.

19728916 is a deficient number, since it is larger than the sum of its proper divisors (17465164).

19728916 is a wasteful number, since it uses less digits than its factorization.

19728916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6103 (or 6101 counting only the distinct ones).

The product of its digits is 54432, while the sum is 43.

The square root of 19728916 is about 4441.7244398994. The cubic root of 19728916 is about 270.2097866589.

The spelling of 19728916 in words is "nineteen million, seven hundred twenty-eight thousand, nine hundred sixteen".