20557041872 has 20 divisors (see below), whose sum is σ = 39831587520. Its totient is φ = 10277922528.

The previous prime is 20557041833. The next prime is 20557041881. The reversal of 20557041872 is 27814075502.

It is a super-2 number, since 2×20557041872² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403529 + ... + 451607.

It is an arithmetic number, because the mean of its divisors is an integer number (1991579376).

Almost surely, 2^20557041872 is an apocalyptic number.

It is an amenable number.

20557041872 is a deficient number, since it is larger than the sum of its proper divisors (19274545648).

20557041872 is a wasteful number, since it uses less digits than its factorization.

20557041872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74810 (or 74804 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 41.

The spelling of 20557041872 in words is "twenty billion, five hundred fifty-seven million, forty-one thousand, eight hundred seventy-two".