20560001 has 16 divisors (see below), whose sum is σ = 25833600. Its totient is φ = 15895680.

The previous prime is 20559991. The next prime is 20560003. The reversal of 20560001 is 10006502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20560001 is a prime.

It is a super-2 number, since 2×20560001² = 845427282240002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20560003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9575 + ... + 11523.

It is an arithmetic number, because the mean of its divisors is an integer number (1614600).

Almost surely, 2^20560001 is an apocalyptic number.

It is an amenable number.

20560001 is a deficient number, since it is larger than the sum of its proper divisors (5273599).

20560001 is a wasteful number, since it uses less digits than its factorization.

20560001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20560001 is about 4534.3137297721. The cubic root of 20560001 is about 273.9519380420.

Adding to 20560001 its reverse (10006502), we get a palindrome (30566503).

It can be divided in two parts, 205 and 60001, that added together give a palindrome (60206).

The spelling of 20560001 in words is "twenty million, five hundred sixty thousand, one".