20550005556 has 24 divisors (see below), whose sum is σ = 48019424544. Its totient is φ = 6840085920.

The previous prime is 20550005543. The next prime is 20550005563. The reversal of 20550005556 is 65550005502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230855 + ... + 1247438.

It is an arithmetic number, because the mean of its divisors is an integer number (2000809356).

Almost surely, 2^20550005556 is an apocalyptic number.

It is an amenable number.

20550005556 is an abundant number, since it is smaller than the sum of its proper divisors (27469418988).

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

20550005556 is a wasteful number, since it uses less digits than its factorization.

20550005556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478991 (or 2478989 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 33.

The spelling of 20550005556 in words is "twenty billion, five hundred fifty million, five thousand, five hundred fifty-six".