20808570528 has 144 divisors (see below), whose sum is σ = 59621365440. Its totient is φ = 6884047872.

The previous prime is 20808570481. The next prime is 20808570539. The reversal of 20808570528 is 82507580802.

20808570528 is a `hidden beast` number, since 20 + 8 + 0 + 8 + 570 + 52 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32361375 + ... + 32362017.

It is an arithmetic number, because the mean of its divisors is an integer number (414037260).

Almost surely, 2^20808570528 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 20808570528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29810682720).

20808570528 is an abundant number, since it is smaller than the sum of its proper divisors (38812794912).

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

20808570528 is a wasteful number, since it uses less digits than its factorization.

20808570528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1320 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The spelling of 20808570528 in words is "twenty billion, eight hundred eight million, five hundred seventy thousand, five hundred twenty-eight".