20530521204 has 12 divisors (see below), whose sum is σ = 47904549504. Its totient is φ = 6843507064.

The previous prime is 20530521173. The next prime is 20530521229. The reversal of 20530521204 is 40212503502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 855438372 + ... + 855438395.

It is an arithmetic number, because the mean of its divisors is an integer number (3992045792).

Almost surely, 2^20530521204 is an apocalyptic number.

It is an amenable number.

20530521204 is an abundant number, since it is smaller than the sum of its proper divisors (27374028300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20530521204 is a wasteful number, since it uses less digits than its factorization.

20530521204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710876774 (or 1710876772 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The spelling of 20530521204 in words is "twenty billion, five hundred thirty million, five hundred twenty-one thousand, two hundred four".