20404201423 has 2 divisors, whose sum is σ = 20404201424. Its totient is φ = 20404201422.

The previous prime is 20404201417. The next prime is 20404201451. The reversal of 20404201423 is 32410240402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20404201423 - 2⁹ = 20404200911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20404201394 and 20404201403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20404201463) 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 as a sum of consecutive naturals, namely, 10202100711 + 10202100712.

It is an arithmetic number, because the mean of its divisors is an integer number (10202100712).

Almost surely, 2^20404201423 is an apocalyptic number.

20404201423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404201423 is an equidigital number, since it uses as much as digits as its factorization.

20404201423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 20404201423 its reverse (32410240402), we get a palindrome (52814441825).

The spelling of 20404201423 in words is "twenty billion, four hundred four million, two hundred one thousand, four hundred twenty-three".