20640068358084 has 144 divisors (see below), whose sum is σ = 60156021452800. Its totient is φ = 5844920352768.

The previous prime is 20640068357983. The next prime is 20640068358113. The reversal of 20640068358084 is 48085386004602.

20640068358084 is a `hidden beast` number, since 2 + 0 + 6 + 400 + 6 + 83 + 5 + 80 + 84 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20640068358084.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31972452 + ... + 32611620.

Almost surely, 2^{20640068358084} 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 20640068358084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30078010726400).

20640068358084 is an abundant number, since it is smaller than the sum of its proper divisors (39515953094716).

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

20640068358084 is a wasteful number, since it uses less digits than its factorization.

20640068358084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640322 (or 640317 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 54.

The spelling of 20640068358084 in words is "twenty trillion, six hundred forty billion, sixty-eight million, three hundred fifty-eight thousand, eighty-four".