20017840068 has 120 divisors (see below), whose sum is σ = 56077715232. Its totient is φ = 6204301056.

The previous prime is 20017840061. The next prime is 20017840069. The reversal of 20017840068 is 86004871002.

20017840068 is a `hidden beast` number, since 20 + 0 + 178 + 400 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20017840061) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 435271 + ... + 479057.

Almost surely, 2^20017840068 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 20017840068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28038857616).

20017840068 is an abundant number, since it is smaller than the sum of its proper divisors (36059875164).

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

20017840068 is a wasteful number, since it uses less digits than its factorization.

20017840068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43903 (or 43892 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The spelling of 20017840068 in words is "twenty billion, seventeen million, eight hundred forty thousand, sixty-eight".