20557671888 has 80 divisors (see below), whose sum is σ = 57293652416. Its totient is φ = 6314250240.

The previous prime is 20557671847. The next prime is 20557671907. The reversal of 20557671888 is 88817675502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327456 + ... + 385152.

Almost surely, 2^20557671888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20557671888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28646826208).

20557671888 is an abundant number, since it is smaller than the sum of its proper divisors (36735980528).

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

20557671888 is a wasteful number, since it uses less digits than its factorization.

20557671888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58292 (or 58286 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 57.

The spelling of 20557671888 in words is "twenty billion, five hundred fifty-seven million, six hundred seventy-one thousand, eight hundred eighty-eight".