20557648416 has 24 divisors (see below), whose sum is σ = 53963827344. Its totient is φ = 6852549440.

The previous prime is 20557648399. The next prime is 20557648439. The reversal of 20557648416 is 61484675502.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 107070990 + ... + 107071181.

It is an arithmetic number, because the mean of its divisors is an integer number (2248492806).

Almost surely, 2^20557648416 is an apocalyptic number.

It is an amenable number.

20557648416 is an abundant number, since it is smaller than the sum of its proper divisors (33406178928).

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

20557648416 is a wasteful number, since it uses less digits than its factorization.

20557648416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214142184 (or 214142176 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 20557648416 in words is "twenty billion, five hundred fifty-seven million, six hundred forty-eight thousand, four hundred sixteen".