20530305515 has 32 divisors (see below), whose sum is σ = 25494393600. Its totient is φ = 15863178240.

The previous prime is 20530305511. The next prime is 20530305533. The reversal of 20530305515 is 51550303502.

It is not a de Polignac number, because 20530305515 - 2² = 20530305511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20530305511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8142455 + ... + 8144975.

It is an arithmetic number, because the mean of its divisors is an integer number (796699800).

Almost surely, 2^20530305515 is an apocalyptic number.

20530305515 is a deficient number, since it is larger than the sum of its proper divisors (4964088085).

20530305515 is a wasteful number, since it uses less digits than its factorization.

20530305515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047.

The product of its (nonzero) digits is 11250, while the sum is 29.

The spelling of 20530305515 in words is "twenty billion, five hundred thirty million, three hundred five thousand, five hundred fifteen".