19923899424 has 144 divisors (see below), whose sum is σ = 61781789664. Its totient is φ = 5573068800.

The previous prime is 19923899419. The next prime is 19923899459. The reversal of 19923899424 is 42499832991.

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 23 ways as a sum of consecutive naturals, for example, 122644 + ... + 234284.

It is an arithmetic number, because the mean of its divisors is an integer number (429040206).

Almost surely, 2^19923899424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19923899424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30890894832).

19923899424 is an abundant number, since it is smaller than the sum of its proper divisors (41857890240).

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

19923899424 is a wasteful number, since it uses less digits than its factorization.

19923899424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111691 (or 111670 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 60.

The spelling of 19923899424 in words is "nineteen billion, nine hundred twenty-three million, eight hundred ninety-nine thousand, four hundred twenty-four".