19691968 has 14 divisors (see below), whose sum is σ = 39076376. Its totient is φ = 9845952.

The previous prime is 19691963. The next prime is 19691977. The reversal of 19691968 is 86919691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19691963) 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 as a sum of consecutive naturals, namely, 153780 + ... + 153907.

Almost surely, 2^19691968 is an apocalyptic number.

It is an amenable number.

19691968 is a deficient number, since it is larger than the sum of its proper divisors (19384408).

19691968 is an equidigital number, since it uses as much as digits as its factorization.

19691968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307699 (or 307689 counting only the distinct ones).

The product of its digits is 209952, while the sum is 49.

The square root of 19691968 is about 4437.5632953232. The cubic root of 19691968 is about 270.0409997181.

It can be divided in two parts, 1 and 9691968, that added together give a palindrome (9691969).

The spelling of 19691968 in words is "nineteen million, six hundred ninety-one thousand, nine hundred sixty-eight".