20560665 has 32 divisors (see below), whose sum is σ = 34062336. Its totient is φ = 10584000.

The previous prime is 20560663. The next prime is 20560697. The reversal of 20560665 is 56606502.

It is not a de Polignac number, because 20560665 - 2¹ = 20560663 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20560663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81790 + ... + 82040.

It is an arithmetic number, because the mean of its divisors is an integer number (1064448).

Almost surely, 2^20560665 is an apocalyptic number.

It is an amenable number.

20560665 is a deficient number, since it is larger than the sum of its proper divisors (13501671).

20560665 is a wasteful number, since it uses less digits than its factorization.

20560665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 20560665 is about 4534.3869486404. The cubic root of 20560665 is about 273.9548871685.

The spelling of 20560665 in words is "twenty million, five hundred sixty thousand, six hundred sixty-five".