20544025423 has 4 divisors (see below), whose sum is σ = 20571164920. Its totient is φ = 20516885928.

The previous prime is 20544025417. The next prime is 20544025501. The reversal of 20544025423 is 32452044502.

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-20544025423 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 (20544025123) 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 3 ways as a sum of consecutive naturals, for example, 13568613 + ... + 13570126.

It is an arithmetic number, because the mean of its divisors is an integer number (5142791230).

Almost surely, 2^20544025423 is an apocalyptic number.

20544025423 is a deficient number, since it is larger than the sum of its proper divisors (27139497).

20544025423 is an equidigital number, since it uses as much as digits as its factorization.

20544025423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27139496.

The product of its (nonzero) digits is 38400, while the sum is 31.

Adding to 20544025423 its reverse (32452044502), we get a palindrome (52996069925).

The spelling of 20544025423 in words is "twenty billion, five hundred forty-four million, twenty-five thousand, four hundred twenty-three".