20591155080 has 192 divisors, whose sum is σ = 68361012720. Its totient is φ = 5373388800.

The previous prime is 20591155061. The next prime is 20591155087. The reversal of 20591155080 is 8055119502.

It is a happy number.

20591155080 is a `hidden beast` number, since 2 + 0 + 591 + 15 + 50 + 8 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 10895601924 + 9695553156 = 104382^2 + 98466^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20591155087) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8794710 + ... + 8797050.

Almost surely, 2^20591155080 is an apocalyptic number.

20591155080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20591155080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34180506360).

20591155080 is an abundant number, since it is smaller than the sum of its proper divisors (47769857640).

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

20591155080 is a wasteful number, since it uses less digits than its factorization.

20591155080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872 (or 2865 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 36.

The spelling of 20591155080 in words is "twenty billion, five hundred ninety-one million, one hundred fifty-five thousand, eighty".