20581395360 has 48 divisors (see below), whose sum is σ = 64831396896. Its totient is φ = 5488371968.

The previous prime is 20581395293. The next prime is 20581395391. The reversal of 20581395360 is 6359318502.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21438474 + ... + 21439433.

It is an arithmetic number, because the mean of its divisors is an integer number (1350654102).

Almost surely, 2^20581395360 is an apocalyptic number.

20581395360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20581395360 is an abundant number, since it is smaller than the sum of its proper divisors (44250001536).

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

20581395360 is a wasteful number, since it uses less digits than its factorization.

20581395360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42877925 (or 42877917 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 20581395360 in words is "twenty billion, five hundred eighty-one million, three hundred ninety-five thousand, three hundred sixty".