19728680 has 16 divisors (see below), whose sum is σ = 44389620. Its totient is φ = 7891456.

The previous prime is 19728629. The next prime is 19728697. The reversal of 19728680 is 8682791.

It can be written as a sum of positive squares in 2 ways, for example, as 19412836 + 315844 = 4406^2 + 562^2 .

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, 246569 + ... + 246648.

Almost surely, 2^19728680 is an apocalyptic number.

19728680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19728680 is an abundant number, since it is smaller than the sum of its proper divisors (24660940).

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

19728680 is a wasteful number, since it uses less digits than its factorization.

19728680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493228 (or 493224 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 19728680 is about 4441.6978735614. The cubic root of 19728680 is about 270.2087092258.

The spelling of 19728680 in words is "nineteen million, seven hundred twenty-eight thousand, six hundred eighty".