19897924 has 12 divisors (see below), whose sum is σ = 34967548. Its totient is φ = 9907200.

The previous prime is 19897919. The next prime is 19897937. The reversal of 19897924 is 42979891.

It can be written as a sum of positive squares in 2 ways, for example, as 8809024 + 11088900 = 2968^2 + 3330^2 .

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, 9357 + ... + 11284.

Almost surely, 2^19897924 is an apocalyptic number.

It is an amenable number.

19897924 is a deficient number, since it is larger than the sum of its proper divisors (15069624).

19897924 is a wasteful number, since it uses less digits than its factorization.

19897924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20886 (or 20884 counting only the distinct ones).

The product of its digits is 326592, while the sum is 49.

The square root of 19897924 is about 4460.7089122694. The cubic root of 19897924 is about 270.9791789671.

The spelling of 19897924 in words is "nineteen million, eight hundred ninety-seven thousand, nine hundred twenty-four".