20555760555 has 64 divisors (see below), whose sum is σ = 39890672640. Its totient is φ = 9960192000.

The previous prime is 20555760517. The next prime is 20555760557. The reversal of 20555760555 is 55506755502.

It is a happy number.

20555760555 is a `hidden beast` number, since 20 + 5 + 5 + 5 + 76 + 0 + 555 = 666.

It is not a de Polignac number, because 20555760555 - 2⁷ = 20555760427 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20555760555.

It is not an unprimeable number, because it can be changed into a prime (20555760557) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3134530 + ... + 3141080.

It is an arithmetic number, because the mean of its divisors is an integer number (623291760).

Almost surely, 2^20555760555 is an apocalyptic number.

20555760555 is a deficient number, since it is larger than the sum of its proper divisors (19334912085).

20555760555 is a wasteful number, since it uses less digits than its factorization.

20555760555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8689 (or 8683 counting only the distinct ones).

The product of its (nonzero) digits is 1312500, while the sum is 45.

The spelling of 20555760555 in words is "twenty billion, five hundred fifty-five million, seven hundred sixty thousand, five hundred fifty-five".