19929085988 has 48 divisors (see below), whose sum is σ = 41779968384. Its totient is φ = 8138914560.

The previous prime is 19929085987. The next prime is 19929086003. The reversal of 19929085988 is 88958092991.

It is a super-2 number, since 2×19929085988² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19929085987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152495 + ... + 251222.

It is an arithmetic number, because the mean of its divisors is an integer number (870416008).

Almost surely, 2^19929085988 is an apocalyptic number.

It is an amenable number.

19929085988 is an abundant number, since it is smaller than the sum of its proper divisors (21850882396).

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

19929085988 is a wasteful number, since it uses less digits than its factorization.

19929085988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403812 (or 403810 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 68.

The spelling of 19929085988 in words is "nineteen billion, nine hundred twenty-nine million, eighty-five thousand, nine hundred eighty-eight".