20557944368 has 40 divisors (see below), whose sum is σ = 45152578800. Its totient is φ = 8988897024.

The previous prime is 20557944367. The next prime is 20557944389. The reversal of 20557944368 is 86344975502.

It is not an unprimeable number, because it can be changed into a prime (20557944367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2597003 + ... + 2604906.

It is an arithmetic number, because the mean of its divisors is an integer number (1128814470).

Almost surely, 2^20557944368 is an apocalyptic number.

It is an amenable number.

20557944368 is an abundant number, since it is smaller than the sum of its proper divisors (24594634432).

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

20557944368 is a wasteful number, since it uses less digits than its factorization.

20557944368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5201949 (or 5201943 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 53.

The spelling of 20557944368 in words is "twenty billion, five hundred fifty-seven million, nine hundred forty-four thousand, three hundred sixty-eight".