20895403488 has 96 divisors (see below), whose sum is σ = 57185606016. Its totient is φ = 6674723328.

The previous prime is 20895403481. The next prime is 20895403493. The reversal of 20895403488 is 88430459802.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×20895403488² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20895403488.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20895403481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171031 + ... + 266537.

It is an arithmetic number, because the mean of its divisors is an integer number (595683396).

Almost surely, 2^20895403488 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 20895403488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28592803008).

20895403488 is an abundant number, since it is smaller than the sum of its proper divisors (36290202528).

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

20895403488 is a wasteful number, since it uses less digits than its factorization.

20895403488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95616 (or 95608 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 51.

The spelling of 20895403488 in words is "twenty billion, eight hundred ninety-five million, four hundred three thousand, four hundred eighty-eight".