20560465565 has 4 divisors (see below), whose sum is σ = 24672558684. Its totient is φ = 16448372448.

The previous prime is 20560465561. The next prime is 20560465571. The reversal of 20560465565 is 56556406502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3416753209 + 17143712356 = 58453^2 + 130934^2 .

It is a cyclic number.

It is not a de Polignac number, because 20560465565 - 2² = 20560465561 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20560465561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2056046552 + ... + 2056046561.

It is an arithmetic number, because the mean of its divisors is an integer number (6168139671).

Almost surely, 2^20560465565 is an apocalyptic number.

It is an amenable number.

20560465565 is a deficient number, since it is larger than the sum of its proper divisors (4112093119).

20560465565 is an equidigital number, since it uses as much as digits as its factorization.

20560465565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4112093118.

The product of its (nonzero) digits is 1080000, while the sum is 44.

The spelling of 20560465565 in words is "twenty billion, five hundred sixty million, four hundred sixty-five thousand, five hundred sixty-five".