20555808768 has 720 divisors, whose sum is σ = 73607788800. Its totient is φ = 5449973760.

The previous prime is 20555808719. The next prime is 20555808799. The reversal of 20555808768 is 86780855502.

It is a happy number.

20555808768 is a `hidden beast` number, since 2 + 0 + 5 + 558 + 0 + 87 + 6 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 708820978 + ... + 708821006.

It is an arithmetic number, because the mean of its divisors is an integer number (102233040).

Almost surely, 2^20555808768 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 20555808768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36803894400).

20555808768 is an abundant number, since it is smaller than the sum of its proper divisors (53051980032).

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

20555808768 is a wasteful number, since it uses less digits than its factorization.

20555808768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 54.

The spelling of 20555808768 in words is "twenty billion, five hundred fifty-five million, eight hundred eight thousand, seven hundred sixty-eight".