20005440523 has 4 divisors (see below), whose sum is σ = 21182231160. Its totient is φ = 18828649888.

The previous prime is 20005440509. The next prime is 20005440551. The reversal of 20005440523 is 32504450002.

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

It is a cyclic number.

It is not a de Polignac number, because 20005440523 - 2⁵ = 20005440491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20005446523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588395293 + ... + 588395326.

It is an arithmetic number, because the mean of its divisors is an integer number (5295557790).

Almost surely, 2^20005440523 is an apocalyptic number.

20005440523 is a deficient number, since it is larger than the sum of its proper divisors (1176790637).

20005440523 is a wasteful number, since it uses less digits than its factorization.

20005440523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176790636.

The product of its (nonzero) digits is 4800, while the sum is 25.

Adding to 20005440523 its reverse (32504450002), we get a palindrome (52509890525).

The spelling of 20005440523 in words is "twenty billion, five million, four hundred forty thousand, five hundred twenty-three".