20423040404023 has 4 divisors (see below), whose sum is σ = 20423300718240. Its totient is φ = 20422780089808.

The previous prime is 20423040403963. The next prime is 20423040404057. The reversal of 20423040404023 is 32040404032402.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20423040404023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20423040403982 and 20423040404000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423040407023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130039390 + ... + 130196347.

It is an arithmetic number, because the mean of its divisors is an integer number (5105825179560).

Almost surely, 2^{20423040404023} is an apocalyptic number.

20423040404023 is a deficient number, since it is larger than the sum of its proper divisors (260314217).

20423040404023 is an equidigital number, since it uses as much as digits as its factorization.

20423040404023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260314216.

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 20423040404023 its reverse (32040404032402), we get a palindrome (52463444436425).

The spelling of 20423040404023 in words is "twenty trillion, four hundred twenty-three billion, forty million, four hundred four thousand, twenty-three".