20340365 has 4 divisors (see below), whose sum is σ = 24408444. Its totient is φ = 16272288.

The previous prime is 20340323. The next prime is 20340373. The reversal of 20340365 is 56304302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56304302 = 2 ⋅28152151.

It can be written as a sum of positive squares in 2 ways, for example, as 6180196 + 14160169 = 2486^2 + 3763^2 .

It is a cyclic number.

It is not a de Polignac number, because 20340365 - 2⁶ = 20340301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20340365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2034032 + ... + 2034041.

It is an arithmetic number, because the mean of its divisors is an integer number (6102111).

Almost surely, 2^20340365 is an apocalyptic number.

It is an amenable number.

20340365 is a deficient number, since it is larger than the sum of its proper divisors (4068079).

20340365 is an equidigital number, since it uses as much as digits as its factorization.

20340365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068078.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 20340365 is about 4510.0293790617. The cubic root of 20340365 is about 272.9729295525.

Adding to 20340365 its reverse (56304302), we get a palindrome (76644667).

The spelling of 20340365 in words is "twenty million, three hundred forty thousand, three hundred sixty-five".