20345032400405 has 64 divisors (see below), whose sum is σ = 25497383731200. Its totient is φ = 15567182588160.

The previous prime is 20345032400393. The next prime is 20345032400417. The reversal of 20345032400405 is 50400423054302.

It is an interprime number because it is at equal distance from previous prime (20345032400393) and next prime (20345032400417).

It is not a de Polignac number, because 20345032400405 - 2⁴ = 20345032400389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11904640691 + ... + 11904642399.

It is an arithmetic number, because the mean of its divisors is an integer number (398396620800).

Almost surely, 2^{20345032400405} is an apocalyptic number.

It is an amenable number.

20345032400405 is a deficient number, since it is larger than the sum of its proper divisors (5152351330795).

20345032400405 is a wasteful number, since it uses less digits than its factorization.

20345032400405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3834.

The product of its (nonzero) digits is 57600, while the sum is 32.

Adding to 20345032400405 its reverse (50400423054302), we get a palindrome (70745455454707).

The spelling of 20345032400405 in words is "twenty trillion, three hundred forty-five billion, thirty-two million, four hundred thousand, four hundred five".