20423144423 has 16 divisors (see below), whose sum is σ = 23528606976. Its totient is φ = 17545271040.

The previous prime is 20423144419. The next prime is 20423144431. The reversal of 20423144423 is 32444132402.

It is not a de Polignac number, because 20423144423 - 2² = 20423144419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423144453) 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, 465290 + ... + 507287.

It is an arithmetic number, because the mean of its divisors is an integer number (1470537936).

Almost surely, 2^20423144423 is an apocalyptic number.

20423144423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20423144423 is a deficient number, since it is larger than the sum of its proper divisors (3105462553).

20423144423 is a wasteful number, since it uses less digits than its factorization.

20423144423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972694.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 20423144423 its reverse (32444132402), we get a palindrome (52867276825).

The spelling of 20423144423 in words is "twenty billion, four hundred twenty-three million, one hundred forty-four thousand, four hundred twenty-three".