19680538 has 4 divisors (see below), whose sum is σ = 29520810. Its totient is φ = 9840268.

The previous prime is 19680527. The next prime is 19680547. The reversal of 19680538 is 83508691.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15944049 + 3736489 = 3993^2 + 1933^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 19680538.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4920133 + ... + 4920136.

Almost surely, 2^19680538 is an apocalyptic number.

19680538 is a deficient number, since it is larger than the sum of its proper divisors (9840272).

19680538 is an equidigital number, since it uses as much as digits as its factorization.

19680538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9840271.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 19680538 is about 4436.2752394323. The cubic root of 19680538 is about 269.9887421003.

The spelling of 19680538 in words is "nineteen million, six hundred eighty thousand, five hundred thirty-eight".