19868544 has 64 divisors (see below), whose sum is σ = 58650000. Its totient is φ = 6621696.

The previous prime is 19868503. The next prime is 19868549. The reversal of 19868544 is 44586891.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 19868544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19868549) 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, 582 + ... + 6330.

Almost surely, 2^19868544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19868544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29325000).

19868544 is an abundant number, since it is smaller than the sum of its proper divisors (38781456).

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

19868544 is an equidigital number, since it uses as much as digits as its factorization.

19868544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5772 (or 5754 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 19868544 is about 4457.4144972170. The cubic root of 19868544 is about 270.8457431053.

The spelling of 19868544 in words is "nineteen million, eight hundred sixty-eight thousand, five hundred forty-four".