20560645 has 12 divisors (see below), whose sum is σ = 28701324. Its totient is φ = 14098560.

The previous prime is 20560601. The next prime is 20560649. The reversal of 20560645 is 54606502.

It can be written as a sum of positive squares in 2 ways, for example, as 15256836 + 5303809 = 3906^2 + 2303^2 .

It is not a de Polignac number, because 20560645 - 2⁷ = 20560517 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 (20560649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41716 + ... + 42205.

It is an arithmetic number, because the mean of its divisors is an integer number (2391777).

Almost surely, 2^20560645 is an apocalyptic number.

It is an amenable number.

20560645 is a deficient number, since it is larger than the sum of its proper divisors (8140679).

20560645 is an equidigital number, since it uses as much as digits as its factorization.

20560645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83940 (or 83933 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20560645 is about 4534.3847432700. The cubic root of 20560645 is about 273.9547983403.

The spelling of 20560645 in words is "twenty million, five hundred sixty thousand, six hundred forty-five".