19668472 has 16 divisors (see below), whose sum is σ = 37346400. Its totient is φ = 9709440.

The previous prime is 19668457. The next prime is 19668487. The reversal of 19668472 is 27486691.

It is an interprime number because it is at equal distance from previous prime (19668457) and next prime (19668487).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14929 + ... + 16192.

It is an arithmetic number, because the mean of its divisors is an integer number (2334150).

Almost surely, 2^19668472 is an apocalyptic number.

It is an amenable number.

19668472 is a deficient number, since it is larger than the sum of its proper divisors (17677928).

19668472 is a wasteful number, since it uses less digits than its factorization.

19668472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31206 (or 31202 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 19668472 is about 4434.9151062901. The cubic root of 19668472 is about 269.9335547516.

The spelling of 19668472 in words is "nineteen million, six hundred sixty-eight thousand, four hundred seventy-two".