20344353405 has 16 divisors (see below), whose sum is σ = 32562855360. Its totient is φ = 10846358528.

The previous prime is 20344353397. The next prime is 20344353413. The reversal of 20344353405 is 50435344302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20344353397) and next prime (20344353413).

It is a cyclic number.

It is not a de Polignac number, because 20344353405 - 2³ = 20344353397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205035 + ... + 287624.

It is an arithmetic number, because the mean of its divisors is an integer number (2035178460).

Almost surely, 2^20344353405 is an apocalyptic number.

It is an amenable number.

20344353405 is a deficient number, since it is larger than the sum of its proper divisors (12218501955).

20344353405 is a wasteful number, since it uses less digits than its factorization.

20344353405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495420.

The product of its (nonzero) digits is 86400, while the sum is 33.

Adding to 20344353405 its reverse (50435344302), we get a palindrome (70779697707).

The spelling of 20344353405 in words is "twenty billion, three hundred forty-four million, three hundred fifty-three thousand, four hundred five".