20420312423 has 16 divisors (see below), whose sum is σ = 23443877376. Its totient is φ = 17423471520.

The previous prime is 20420312383. The next prime is 20420312443. The reversal of 20420312423 is 32421302402.

It is not a de Polignac number, because 20420312423 - 2⁸ = 20420312167 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 (20420312443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2160518 + ... + 2169948.

It is an arithmetic number, because the mean of its divisors is an integer number (1465242336).

Almost surely, 2^20420312423 is an apocalyptic number.

20420312423 is a deficient number, since it is larger than the sum of its proper divisors (3023564953).

20420312423 is a wasteful number, since it uses less digits than its factorization.

20420312423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10814.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 20420312423 its reverse (32421302402), we get a palindrome (52841614825).

The spelling of 20420312423 in words is "twenty billion, four hundred twenty million, three hundred twelve thousand, four hundred twenty-three".