20364565 has 8 divisors (see below), whose sum is σ = 26317368. Its totient is φ = 15038400.

The previous prime is 20364563. The next prime is 20364569. The reversal of 20364565 is 56546302.

It can be written as a sum of positive squares in 4 ways, for example, as 213444 + 20151121 = 462^2 + 4489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20364565 - 2¹ = 20364563 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 (20364563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156586 + ... + 156715.

It is an arithmetic number, because the mean of its divisors is an integer number (3289671).

Almost surely, 2^20364565 is an apocalyptic number.

It is an amenable number.

20364565 is a deficient number, since it is larger than the sum of its proper divisors (5952803).

20364565 is a wasteful number, since it uses less digits than its factorization.

20364565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313319.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 20364565 is about 4512.7114908888. The cubic root of 20364565 is about 273.0811433892.

The spelling of 20364565 in words is "twenty million, three hundred sixty-four thousand, five hundred sixty-five".