18000039000020 has 576 divisors, whose sum is σ = 49367501568000. Its totient is φ = 5354114411520.

The previous prime is 18000038999981. The next prime is 18000039000037. The reversal of 18000039000020 is 2000093000081.

It is a self number, because there is not a number n which added to its sum of digits gives 18000039000020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 51576042806 + ... + 51576043154.

It is an arithmetic number, because the mean of its divisors is an integer number (85707468000).

Almost surely, 2^{18000039000020} is an apocalyptic number.

18000039000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18000039000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24683750784000).

18000039000020 is an abundant number, since it is smaller than the sum of its proper divisors (31367462567980).

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

18000039000020 is a wasteful number, since it uses less digits than its factorization.

18000039000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 18000039000020 in words is "eighteen trillion, thirty-nine million, twenty", and thus it is an aban number and an uban number.