20018097875856 has 160 divisors (see below), whose sum is σ = 54816317602560. Its totient is φ = 6273203765248.

The previous prime is 20018097875849. The next prime is 20018097875861. The reversal of 20018097875856 is 65857879081002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4069543765 + ... + 4069548683.

It is an arithmetic number, because the mean of its divisors is an integer number (342601985016).

Almost surely, 2^{20018097875856} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20018097875856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27408158801280).

20018097875856 is an abundant number, since it is smaller than the sum of its proper divisors (34798219726704).

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

20018097875856 is a wasteful number, since it uses less digits than its factorization.

20018097875856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9481 (or 9475 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 66.

The spelling of 20018097875856 in words is "twenty trillion, eighteen billion, ninety-seven million, eight hundred seventy-five thousand, eight hundred fifty-six".