18020711982 has 32 divisors (see below), whose sum is σ = 44358676992. Its totient is φ = 4752715104.

The previous prime is 18020711971. The next prime is 18020712029. The reversal of 18020711982 is 28911702081.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 18020711982.

It is a congruent number.

It is an unprimeable number.

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, 16501938 + ... + 16503029.

It is an arithmetic number, because the mean of its divisors is an integer number (1386208656).

Almost surely, 2^18020711982 is an apocalyptic number.

18020711982 is an abundant number, since it is smaller than the sum of its proper divisors (26337965010).

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

18020711982 is a wasteful number, since it uses less digits than its factorization.

18020711982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33004992.

The product of its (nonzero) digits is 16128, while the sum is 39.

The spelling of 18020711982 in words is "eighteen billion, twenty million, seven hundred eleven thousand, nine hundred eighty-two".