19951323924 has 72 divisors (see below), whose sum is σ = 55041456288. Its totient is φ = 5606919360.

The previous prime is 19951323919. The next prime is 19951323949. The reversal of 19951323924 is 42932315991.

It is a congruent number.

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, 242254 + ... + 313989.

Almost surely, 2^19951323924 is an apocalyptic number.

19951323924 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19951323924 is an abundant number, since it is smaller than the sum of its proper divisors (35090132364).

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

19951323924 is a wasteful number, since it uses less digits than its factorization.

19951323924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556325 (or 556316 counting only the distinct ones).

The product of its digits is 524880, while the sum is 48.

The spelling of 19951323924 in words is "nineteen billion, nine hundred fifty-one million, three hundred twenty-three thousand, nine hundred twenty-four".