19999968 has 24 divisors (see below), whose sum is σ = 52500168. Its totient is φ = 6666624.

The previous prime is 19999963. The next prime is 19999981. The reversal of 19999968 is 86999991.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104071 + ... + 104262.

It is an arithmetic number, because the mean of its divisors is an integer number (2187507).

Almost surely, 2^19999968 is an apocalyptic number.

It is an amenable number.

19999968 is an abundant number, since it is smaller than the sum of its proper divisors (32500200).

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

19999968 is a wasteful number, since it uses less digits than its factorization.

19999968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208346 (or 208338 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 60.

The square root of 19999968 is about 4472.1323772894. The cubic root of 19999968 is about 271.4416168905.

The spelling of 19999968 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred sixty-eight".