19923872 has 12 divisors (see below), whose sum is σ = 39225186. Its totient is φ = 9961920.

The previous prime is 19923859. The next prime is 19923889. The reversal of 19923872 is 27832991.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10214416 + 9709456 = 3196^2 + 3116^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311279 + ... + 311342.

Almost surely, 2^19923872 is an apocalyptic number.

It is an amenable number.

19923872 is a deficient number, since it is larger than the sum of its proper divisors (19301314).

19923872 is an equidigital number, since it uses as much as digits as its factorization.

19923872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622631 (or 622623 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 19923872 is about 4463.6164709796. The cubic root of 19923872 is about 271.0969184444.

The spelling of 19923872 in words is "nineteen million, nine hundred twenty-three thousand, eight hundred seventy-two".