20343220423 has 16 divisors (see below), whose sum is σ = 20609420832. Its totient is φ = 20079360000.

The previous prime is 20343220399. The next prime is 20343220477. The reversal of 20343220423 is 32402234302.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20343220423 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 (20343220483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17491440 + ... + 17492602.

It is an arithmetic number, because the mean of its divisors is an integer number (1288088802).

Almost surely, 2^20343220423 is an apocalyptic number.

20343220423 is a deficient number, since it is larger than the sum of its proper divisors (266200409).

20343220423 is a wasteful number, since it uses less digits than its factorization.

20343220423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986.

The product of its (nonzero) digits is 6912, while the sum is 25.

Adding to 20343220423 its reverse (32402234302), we get a palindrome (52745454725).

The spelling of 20343220423 in words is "twenty billion, three hundred forty-three million, two hundred twenty thousand, four hundred twenty-three".