20344405 has 8 divisors (see below), whose sum is σ = 25008984. Its totient is φ = 15878400.

The previous prime is 20344403. The next prime is 20344417. The reversal of 20344405 is 50444302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3378244 + 16966161 = 1838^2 + 4119^2 .

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

It is not a de Polignac number, because 20344405 - 2¹ = 20344403 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 (20344403) 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, 49416 + ... + 49825.

It is an arithmetic number, because the mean of its divisors is an integer number (3126123).

Almost surely, 2^20344405 is an apocalyptic number.

It is an amenable number.

20344405 is a deficient number, since it is larger than the sum of its proper divisors (4664579).

20344405 is an equidigital number, since it uses as much as digits as its factorization.

20344405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99287.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20344405 is about 4510.4772474761. The cubic root of 20344405 is about 272.9910009691.

Adding to 20344405 its reverse (50444302), we get a palindrome (70788707).

The spelling of 20344405 in words is "twenty million, three hundred forty-four thousand, four hundred five".