20560309056 has 560 divisors, whose sum is σ = 73564902400. Its totient is φ = 5669637120.

The previous prime is 20560309043. The next prime is 20560309069. The reversal of 20560309056 is 65090306502.

20560309056 is a `hidden beast` number, since 2 + 0 + 560 + 3 + 0 + 90 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (20560309043) and next prime (20560309069).

It is a super-2 number, since 2×20560309056² (a number of 21 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20560309056.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 55121286 + ... + 55121658.

Almost surely, 2^20560309056 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 20560309056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36782451200).

20560309056 is an abundant number, since it is smaller than the sum of its proper divisors (53004593344).

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

20560309056 is an equidigital number, since it uses as much as digits as its factorization.

20560309056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The spelling of 20560309056 in words is "twenty billion, five hundred sixty million, three hundred nine thousand, fifty-six".