19716988 has 12 divisors (see below), whose sum is σ = 34569360. Its totient is φ = 9840032.

The previous prime is 19716959. The next prime is 19716989. The reversal of 19716988 is 88961791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19716989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2056 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (2880780).

Almost surely, 2^19716988 is an apocalyptic number.

It is an amenable number.

19716988 is a deficient number, since it is larger than the sum of its proper divisors (14852372).

19716988 is a wasteful number, since it uses less digits than its factorization.

19716988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9236 (or 9234 counting only the distinct ones).

The product of its digits is 217728, while the sum is 49.

The square root of 19716988 is about 4440.3815151403. The cubic root of 19716988 is about 270.1553198701.

The spelling of 19716988 in words is "nineteen million, seven hundred sixteen thousand, nine hundred eighty-eight".