20512265816705 has 32 divisors (see below), whose sum is σ = 26735373571200. Its totient is φ = 15107549236416.

The previous prime is 20512265816689. The next prime is 20512265816711. The reversal of 20512265816705 is 50761856221502.

It is not a de Polignac number, because 20512265816705 - 2⁴ = 20512265816689 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 1699862 + ... + 6626768.

It is an arithmetic number, because the mean of its divisors is an integer number (835480424100).

Almost surely, 2^{20512265816705} is an apocalyptic number.

It is an amenable number.

20512265816705 is a deficient number, since it is larger than the sum of its proper divisors (6223107754495).

20512265816705 is an equidigital number, since it uses as much as digits as its factorization.

20512265816705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4927330 (or 4927304 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 50.

The spelling of 20512265816705 in words is "twenty trillion, five hundred twelve billion, two hundred sixty-five million, eight hundred sixteen thousand, seven hundred five".