20554645600 has 72 divisors (see below), whose sum is σ = 53130771288. Its totient is φ = 7738214400.

The previous prime is 20554645597. The next prime is 20554645619. The reversal of 20554645600 is 654645502.

It is a self number, because there is not a number n which added to its sum of digits gives 20554645600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 742086 + ... + 769285.

It is an arithmetic number, because the mean of its divisors is an integer number (737927379).

Almost surely, 2^20554645600 is an apocalyptic number.

20554645600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20554645600 is an abundant number, since it is smaller than the sum of its proper divisors (32576125688).

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

20554645600 is a wasteful number, since it uses less digits than its factorization.

20554645600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511408 (or 1511395 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 20554645600 in words is "twenty billion, five hundred fifty-four million, six hundred forty-five thousand, six hundred".