20555706065505 has 32 divisors (see below), whose sum is σ = 35510114465280. Its totient is φ = 10093717443840.

The previous prime is 20555706065501. The next prime is 20555706065513. The reversal of 20555706065505 is 50556060755502.

It is not a de Polignac number, because 20555706065505 - 2² = 20555706065501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20555706065501) 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, 135417561 + ... + 135569270.

It is an arithmetic number, because the mean of its divisors is an integer number (1109691077040).

Almost surely, 2^{20555706065505} is an apocalyptic number.

It is an amenable number.

20555706065505 is a deficient number, since it is larger than the sum of its proper divisors (14954408399775).

20555706065505 is a wasteful number, since it uses less digits than its factorization.

20555706065505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270987241.

The product of its (nonzero) digits is 7875000, while the sum is 51.

The spelling of 20555706065505 in words is "twenty trillion, five hundred fifty-five billion, seven hundred six million, sixty-five thousand, five hundred five".