20556555498 has 48 divisors (see below), whose sum is σ = 44691192000. Its totient is φ = 6828846912.

The previous prime is 20556555433. The next prime is 20556555511. The reversal of 20556555498 is 89455565502.

It is a happy number.

20556555498 is a `hidden beast` number, since 20 + 5 + 5 + 65 + 554 + 9 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9546790 + ... + 9548942.

It is an arithmetic number, because the mean of its divisors is an integer number (931066500).

Almost surely, 2^20556555498 is an apocalyptic number.

20556555498 is an abundant number, since it is smaller than the sum of its proper divisors (24134636502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20556555498 is a wasteful number, since it uses less digits than its factorization.

20556555498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3723 (or 3720 counting only the distinct ones).

The product of its (nonzero) digits is 10800000, while the sum is 54.

The spelling of 20556555498 in words is "twenty billion, five hundred fifty-six million, five hundred fifty-five thousand, four hundred ninety-eight".