20331365 has 4 divisors (see below), whose sum is σ = 24397644. Its totient is φ = 16265088.

The previous prime is 20331329. The next prime is 20331373. The reversal of 20331365 is 56313302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5230369 + 15100996 = 2287^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331365 - 2⁶ = 20331301 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 20331365.

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, 2033132 + ... + 2033141.

It is an arithmetic number, because the mean of its divisors is an integer number (6099411).

Almost surely, 2^20331365 is an apocalyptic number.

It is an amenable number.

20331365 is a deficient number, since it is larger than the sum of its proper divisors (4066279).

20331365 is an equidigital number, since it uses as much as digits as its factorization.

20331365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066278.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 20331365 is about 4509.0314924604. The cubic root of 20331365 is about 272.9326628414.

Adding to 20331365 its reverse (56313302), we get a palindrome (76644667).

The spelling of 20331365 in words is "twenty million, three hundred thirty-one thousand, three hundred sixty-five".