20344465 has 4 divisors (see below), whose sum is σ = 24413364. Its totient is φ = 16275568.

The previous prime is 20344453. The next prime is 20344469. The reversal of 20344465 is 56444302.

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 9690769 + 10653696 = 3113^2 + 3264^2 .

It is a cyclic number.

It is not a de Polignac number, because 20344465 - 2⁵ = 20344433 is a prime.

It is a super-2 number, since 2×20344465² = 827794512272450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20344469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2034442 + ... + 2034451.

It is an arithmetic number, because the mean of its divisors is an integer number (6103341).

Almost surely, 2^20344465 is an apocalyptic number.

It is an amenable number.

20344465 is a deficient number, since it is larger than the sum of its proper divisors (4068899).

20344465 is an equidigital number, since it uses as much as digits as its factorization.

20344465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4068898.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 20344465 is about 4510.4838986521. The cubic root of 20344465 is about 272.9912693384.

Adding to 20344465 its reverse (56444302), we get a palindrome (76788767).

The spelling of 20344465 in words is "twenty million, three hundred forty-four thousand, four hundred sixty-five".