19999924 has 12 divisors (see below), whose sum is σ = 39999904. Its totient is φ = 8571384.

The previous prime is 19999909. The next prime is 19999927. The reversal of 19999924 is 42999991.

19999924 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357114 + ... + 357169.

Almost surely, 2^19999924 is an apocalyptic number.

19999924 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19999924 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19999924 is a wasteful number, since it uses less digits than its factorization.

19999924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714294 (or 714292 counting only the distinct ones).

The product of its digits is 472392, while the sum is 52.

The square root of 19999924 is about 4472.1274579332. The cubic root of 19999924 is about 271.4414178328.

The spelling of 19999924 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred twenty-four".