20513105504530 has 8 divisors (see below), whose sum is σ = 36923589908172. Its totient is φ = 8205242201808.

The previous prime is 20513105504519. The next prime is 20513105504539. The reversal of 20513105504530 is 3540550131502.

It can be written as a sum of positive squares in 2 ways, for example, as 19274040428841 + 1239065075689 = 4390221^2 + 1113133^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20513105504539) by changing a digit.

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, 1025655275217 + ... + 1025655275236.

Almost surely, 2^{20513105504530} is an apocalyptic number.

20513105504530 is a deficient number, since it is larger than the sum of its proper divisors (16410484403642).

20513105504530 is a wasteful number, since it uses less digits than its factorization.

20513105504530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051310550460.

The product of its (nonzero) digits is 45000, while the sum is 34.

The spelling of 20513105504530 in words is "twenty trillion, five hundred thirteen billion, one hundred five million, five hundred four thousand, five hundred thirty".