19949568 has 96 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 6225920.

The previous prime is 19949561. The next prime is 19949581. The reversal of 19949568 is 86594991.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 19949568.

It is not an unprimeable number, because it can be changed into a prime (19949561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104353 + ... + 104543.

It is an arithmetic number, because the mean of its divisors is an integer number (589680).

Almost surely, 2^19949568 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 19949568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28304640).

19949568 is an abundant number, since it is smaller than the sum of its proper divisors (36659712).

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

19949568 is a wasteful number, since it uses less digits than its factorization.

19949568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 213 counting only the distinct ones).

The product of its digits is 699840, while the sum is 51.

The square root of 19949568 is about 4466.4939270081. The cubic root of 19949568 is about 271.2134137691.

The spelling of 19949568 in words is "nineteen million, nine hundred forty-nine thousand, five hundred sixty-eight".