20556225550 has 48 divisors (see below), whose sum is σ = 45106255872. Its totient is φ = 6820495200.

The previous prime is 20556225541. The next prime is 20556225553. The reversal of 20556225550 is 5552265502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556225553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 936442 + ... + 958141.

It is an arithmetic number, because the mean of its divisors is an integer number (939713664).

Almost surely, 2^20556225550 is an apocalyptic number.

20556225550 is an abundant number, since it is smaller than the sum of its proper divisors (24550030322).

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

20556225550 is a wasteful number, since it uses less digits than its factorization.

20556225550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894633 (or 1894628 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 37.

The spelling of 20556225550 in words is "twenty billion, five hundred fifty-six million, two hundred twenty-five thousand, five hundred fifty".