19729347018 has 32 divisors (see below), whose sum is σ = 39708049920. Its totient is φ = 6535021680.

The previous prime is 19729347013. The next prime is 19729347049. The reversal of 19729347018 is 81074392791.

It is not an unprimeable number, because it can be changed into a prime (19729347013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 593523 + ... + 625881.

It is an arithmetic number, because the mean of its divisors is an integer number (1240876560).

Almost surely, 2^19729347018 is an apocalyptic number.

19729347018 is an abundant number, since it is smaller than the sum of its proper divisors (19978702902).

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

19729347018 is a wasteful number, since it uses less digits than its factorization.

19729347018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33002.

The product of its (nonzero) digits is 762048, while the sum is 51.

The spelling of 19729347018 in words is "nineteen billion, seven hundred twenty-nine million, three hundred forty-seven thousand, eighteen".