19699968 has 72 divisors (see below), whose sum is σ = 53127648. Its totient is φ = 6479872.

The previous prime is 19699951. The next prime is 19699969. The reversal of 19699968 is 86999691.

It is not an unprimeable number, because it can be changed into a prime (19699969) 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, 86671 + ... + 86897.

It is an arithmetic number, because the mean of its divisors is an integer number (737884).

Almost surely, 2^19699968 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 19699968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26563824).

19699968 is an abundant number, since it is smaller than the sum of its proper divisors (33427680).

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

19699968 is a wasteful number, since it uses less digits than its factorization.

19699968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 345 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 57.

The square root of 19699968 is about 4438.4645993857. The cubic root of 19699968 is about 270.0775634499.

It can be divided in two parts, 1 and 9699968, that added together give a palindrome (9699969).

The spelling of 19699968 in words is "nineteen million, six hundred ninety-nine thousand, nine hundred sixty-eight".