19887168 has 56 divisors (see below), whose sum is σ = 60139072. Its totient is φ = 5681664.

The previous prime is 19887163. The next prime is 19887169. The reversal of 19887168 is 86178891.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (19887163) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 6055 + ... + 8742.

It is an arithmetic number, because the mean of its divisors is an integer number (1073912).

Almost surely, 2^19887168 is an apocalyptic number.

It is an amenable number.

19887168 is an abundant number, since it is smaller than the sum of its proper divisors (40251904).

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

19887168 is a wasteful number, since it uses less digits than its factorization.

19887168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14819 (or 14809 counting only the distinct ones).

The product of its digits is 193536, while the sum is 48.

The square root of 19887168 is about 4459.5031113343. The cubic root of 19887168 is about 270.9303434305.

The spelling of 19887168 in words is "nineteen million, eight hundred eighty-seven thousand, one hundred sixty-eight".