19909924 has 12 divisors (see below), whose sum is σ = 36892044. Its totient is φ = 9369344.

The previous prime is 19909919. The next prime is 19909931. The reversal of 19909924 is 42990991.

It can be written as a sum of positive squares in 2 ways, for example, as 5712100 + 14197824 = 2390^2 + 3768^2 .

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, 146329 + ... + 146464.

It is an arithmetic number, because the mean of its divisors is an integer number (3074337).

Almost surely, 2^19909924 is an apocalyptic number.

It is an amenable number.

19909924 is a deficient number, since it is larger than the sum of its proper divisors (16982120).

19909924 is a wasteful number, since it uses less digits than its factorization.

19909924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292814 (or 292812 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 19909924 is about 4462.0537872150. The cubic root of 19909924 is about 271.0336418795.

The spelling of 19909924 in words is "nineteen million, nine hundred nine thousand, nine hundred twenty-four".