20556555496 has 16 divisors (see below), whose sum is σ = 38545137540. Its totient is φ = 10277852160.

The previous prime is 20556555433. The next prime is 20556555511. The reversal of 20556555496 is 69455565502.

It can be written as a sum of positive squares in 2 ways, for example, as 20132772100 + 423783396 = 141890^2 + 20586^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261786 + ... + 331126.

Almost surely, 2^20556555496 is an apocalyptic number.

It is an amenable number.

20556555496 is a deficient number, since it is larger than the sum of its proper divisors (17988582044).

20556555496 is a wasteful number, since it uses less digits than its factorization.

20556555496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106404 (or 106400 counting only the distinct ones).

The product of its (nonzero) digits is 8100000, while the sum is 52.

The spelling of 20556555496 in words is "twenty billion, five hundred fifty-six million, five hundred fifty-five thousand, four hundred ninety-six".