20530728530 has 16 divisors (see below), whose sum is σ = 39798027864. Its totient is φ = 7580576640.

The previous prime is 20530728511. The next prime is 20530728563. The reversal of 20530728530 is 3582703502.

It can be written as a sum of positive squares in 4 ways, for example, as 14618502649 + 5912225881 = 120907^2 + 76891^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 78964211 + ... + 78964470.

Almost surely, 2^20530728530 is an apocalyptic number.

20530728530 is a deficient number, since it is larger than the sum of its proper divisors (19267299334).

20530728530 is a wasteful number, since it uses less digits than its factorization.

20530728530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157928701.

The product of its (nonzero) digits is 50400, while the sum is 35.

It can be divided in two parts, 2053072 and 8530, that added together give a palindrome (2061602).

The spelling of 20530728530 in words is "twenty billion, five hundred thirty million, seven hundred twenty-eight thousand, five hundred thirty".