20515503241 has 4 divisors (see below), whose sum is σ = 20516078484. Its totient is φ = 20514928000.

The previous prime is 20515503233. The next prime is 20515503271. The reversal of 20515503241 is 14230551502.

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 5045118841 + 15470384400 = 71029^2 + 124380^2 .

It is a cyclic number.

It is not a de Polignac number, because 20515503241 - 2³ = 20515503233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20515503221) 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, 230320 + ... + 306721.

It is an arithmetic number, because the mean of its divisors is an integer number (5129019621).

Almost surely, 2^20515503241 is an apocalyptic number.

It is an amenable number.

20515503241 is a deficient number, since it is larger than the sum of its proper divisors (575243).

20515503241 is an equidigital number, since it uses as much as digits as its factorization.

20515503241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575242.

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 20515503241 in words is "twenty billion, five hundred fifteen million, five hundred three thousand, two hundred forty-one".