20560687056 has 320 divisors, whose sum is σ = 76461772800. Its totient is φ = 5137012224.

The previous prime is 20560687051. The next prime is 20560687067. The reversal of 20560687056 is 65078606502.

20560687056 is a `hidden beast` number, since 2 + 0 + 560 + 6 + 87 + 0 + 5 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20560687051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 733165 + ... + 760691.

It is an arithmetic number, because the mean of its divisors is an integer number (238943040).

Almost surely, 2^20560687056 is an apocalyptic number.

20560687056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20560687056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38230886400).

20560687056 is an abundant number, since it is smaller than the sum of its proper divisors (55901085744).

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

20560687056 is a wasteful number, since it uses less digits than its factorization.

20560687056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27583 (or 27571 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 20560687056 in words is "twenty billion, five hundred sixty million, six hundred eighty-seven thousand, fifty-six".