20394395568 has 320 divisors, whose sum is σ = 62224588800. Its totient is φ = 6386688000.

The previous prime is 20394395531. The next prime is 20394395591. The reversal of 20394395568 is 86559349302.

20394395568 is a `hidden beast` number, since 2 + 0 + 39 + 43 + 9 + 5 + 568 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 84623928 + ... + 84624168.

It is an arithmetic number, because the mean of its divisors is an integer number (194451840).

Almost surely, 2^20394395568 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 20394395568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31112294400).

20394395568 is an abundant number, since it is smaller than the sum of its proper divisors (41830193232).

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

20394395568 is a wasteful number, since it uses less digits than its factorization.

20394395568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 20394395568 in words is "twenty billion, three hundred ninety-four million, three hundred ninety-five thousand, five hundred sixty-eight".