20442540005 has 4 divisors (see below), whose sum is σ = 24531048012. Its totient is φ = 16354032000.

The previous prime is 20442539989. The next prime is 20442540037. The reversal of 20442540005 is 50004524402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11189831524 + 9252708481 = 105782^2 + 96191^2 .

It is not a de Polignac number, because 20442540005 - 2⁴ = 20442539989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2044253996 + ... + 2044254005.

It is an arithmetic number, because the mean of its divisors is an integer number (6132762003).

Almost surely, 2^20442540005 is an apocalyptic number.

It is an amenable number.

20442540005 is a deficient number, since it is larger than the sum of its proper divisors (4088508007).

20442540005 is an equidigital number, since it uses as much as digits as its factorization.

20442540005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088508006.

The product of its (nonzero) digits is 6400, while the sum is 26.

The spelling of 20442540005 in words is "twenty billion, four hundred forty-two million, five hundred forty thousand, five".