20788360521 has 16 divisors (see below), whose sum is σ = 28318598400. Its totient is φ = 13558745088.

The previous prime is 20788360517. The next prime is 20788360559. The reversal of 20788360521 is 12506388702.

It is not a de Polignac number, because 20788360521 - 2² = 20788360517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20784360521) 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 15 ways as a sum of consecutive naturals, for example, 351735 + ... + 406563.

It is an arithmetic number, because the mean of its divisors is an integer number (1769912400).

Almost surely, 2^20788360521 is an apocalyptic number.

It is an amenable number.

20788360521 is a deficient number, since it is larger than the sum of its proper divisors (7530237879).

20788360521 is a wasteful number, since it uses less digits than its factorization.

20788360521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57568.

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 20788360521 in words is "twenty billion, seven hundred eighty-eight million, three hundred sixty thousand, five hundred twenty-one".