20591013888 has 260 divisors, whose sum is σ = 62725432968. Its totient is φ = 6728417280.

The previous prime is 20591013881. The next prime is 20591013889. The reversal of 20591013888 is 88831019502.

It is a happy number.

20591013888 is a `hidden beast` number, since 20 + 591 + 0 + 1 + 38 + 8 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20591013881) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 17583543 + ... + 17584713.

Almost surely, 2^20591013888 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 20591013888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31362716484).

20591013888 is an abundant number, since it is smaller than the sum of its proper divisors (42134419080).

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

20591013888 is an equidigital number, since it uses as much as digits as its factorization.

20591013888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260 (or 1229 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 20591013888 in words is "twenty billion, five hundred ninety-one million, thirteen thousand, eight hundred eighty-eight".