19985728018 has 8 divisors (see below), whose sum is σ = 31556412720. Its totient is φ = 9466923780.

The previous prime is 19985727997. The next prime is 19985728019. The reversal of 19985728018 is 81082758991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (19985728019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262970068 + ... + 262970143.

It is an arithmetic number, because the mean of its divisors is an integer number (3944551590).

Almost surely, 2^19985728018 is an apocalyptic number.

19985728018 is a deficient number, since it is larger than the sum of its proper divisors (11570684702).

19985728018 is a wasteful number, since it uses less digits than its factorization.

19985728018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525940232.

The product of its (nonzero) digits is 2903040, while the sum is 58.

The spelling of 19985728018 in words is "nineteen billion, nine hundred eighty-five million, seven hundred twenty-eight thousand, eighteen".