19967872 has 32 divisors (see below), whose sum is σ = 40000320. Its totient is φ = 9928704.

The previous prime is 19967839. The next prime is 19967881. The reversal of 19967872 is 27876991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

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, 32593 + ... + 33199.

It is an arithmetic number, because the mean of its divisors is an integer number (1250010).

Almost surely, 2^19967872 is an apocalyptic number.

It is an amenable number.

19967872 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

19967872 is an equidigital number, since it uses as much as digits as its factorization.

19967872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878 (or 866 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

The square root of 19967872 is about 4468.5424916856. The cubic root of 19967872 is about 271.2963357456.

The spelling of 19967872 in words is "nineteen million, nine hundred sixty-seven thousand, eight hundred seventy-two".