19647968 has 12 divisors (see below), whose sum is σ = 38682000. Its totient is φ = 9823968.

The previous prime is 19647967. The next prime is 19647989. The reversal of 19647968 is 86974691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19647961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306968 + ... + 307031.

It is an arithmetic number, because the mean of its divisors is an integer number (3223500).

Almost surely, 2^19647968 is an apocalyptic number.

It is an amenable number.

19647968 is a deficient number, since it is larger than the sum of its proper divisors (19034032).

19647968 is an equidigital number, since it uses as much as digits as its factorization.

19647968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614009 (or 614001 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The square root of 19647968 is about 4432.6028470866. The cubic root of 19647968 is about 269.8397219753.

The spelling of 19647968 in words is "nineteen million, six hundred forty-seven thousand, nine hundred sixty-eight".