20423131423 has 4 divisors (see below), whose sum is σ = 20495811888. Its totient is φ = 20350450960.

The previous prime is 20423131403. The next prime is 20423131447. The reversal of 20423131423 is 32413132402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20423131423 - 2⁹ = 20423130911 is a prime.

It is a super-2 number, since 2×20423131423² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423131403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36339811 + ... + 36340372.

It is an arithmetic number, because the mean of its divisors is an integer number (5123952972).

Almost surely, 2^20423131423 is an apocalyptic number.

20423131423 is a deficient number, since it is larger than the sum of its proper divisors (72680465).

20423131423 is an equidigital number, since it uses as much as digits as its factorization.

20423131423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72680464.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 20423131423 its reverse (32413132402), we get a palindrome (52836263825).

The spelling of 20423131423 in words is "twenty billion, four hundred twenty-three million, one hundred thirty-one thousand, four hundred twenty-three".