20412340423 has 4 divisors (see below), whose sum is σ = 20412643680. Its totient is φ = 20412037168.

The previous prime is 20412340409. The next prime is 20412340441. The reversal of 20412340423 is 32404321402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 32404321402 = 2 ⋅16202160701.

It is a cyclic number.

It is not a de Polignac number, because 20412340423 - 2¹³ = 20412332231 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 (20412340493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358 + ... + 202051.

It is an arithmetic number, because the mean of its divisors is an integer number (5103160920).

Almost surely, 2^20412340423 is an apocalyptic number.

20412340423 is a deficient number, since it is larger than the sum of its proper divisors (303257).

20412340423 is a wasteful number, since it uses less digits than its factorization.

20412340423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303256.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 20412340423 its reverse (32404321402), we get a palindrome (52816661825).

The spelling of 20412340423 in words is "twenty billion, four hundred twelve million, three hundred forty thousand, four hundred twenty-three".