20340434121423 has 32 divisors (see below), whose sum is σ = 30614931621120. Its totient is φ = 11927895356160.

The previous prime is 20340434121407. The next prime is 20340434121433. The reversal of 20340434121423 is 32412143404302.

It is not a de Polignac number, because 20340434121423 - 2⁴ = 20340434121407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340434121433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147846613 + ... + 147984126.

It is an arithmetic number, because the mean of its divisors is an integer number (956716613160).

Almost surely, 2^{20340434121423} is an apocalyptic number.

20340434121423 is a deficient number, since it is larger than the sum of its proper divisors (10274497499697).

20340434121423 is a wasteful number, since it uses less digits than its factorization.

20340434121423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295830839.

The product of its (nonzero) digits is 55296, while the sum is 33.

Adding to 20340434121423 its reverse (32412143404302), we get a palindrome (52752577525725).

The spelling of 20340434121423 in words is "twenty trillion, three hundred forty billion, four hundred thirty-four million, one hundred twenty-one thousand, four hundred twenty-three".