20555760556 has 6 divisors (see below), whose sum is σ = 35972580980. Its totient is φ = 10277880276.

The previous prime is 20555760517. The next prime is 20555760557. The reversal of 20555760556 is 65506755502.

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 as a sum of consecutive naturals, namely, 2569470066 + ... + 2569470073.

Almost surely, 2^20555760556 is an apocalyptic number.

It is an amenable number.

20555760556 is a deficient number, since it is larger than the sum of its proper divisors (15416820424).

20555760556 is a wasteful number, since it uses less digits than its factorization.

20555760556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5138940143 (or 5138940141 counting only the distinct ones).

The product of its (nonzero) digits is 1575000, while the sum is 46.

The spelling of 20555760556 in words is "twenty billion, five hundred fifty-five million, seven hundred sixty thousand, five hundred fifty-six".