20581248880 has 40 divisors (see below), whose sum is σ = 49018518864. Its totient is φ = 8031705600.

The previous prime is 20581248847. The next prime is 20581248881. The reversal of 20581248880 is 8884218502.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20581248880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20581248881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3134106 + ... + 3140665.

Almost surely, 2^20581248880 is an apocalyptic number.

20581248880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20581248880 is an abundant number, since it is smaller than the sum of its proper divisors (28437269984).

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

20581248880 is a wasteful number, since it uses less digits than its factorization.

20581248880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6274825 (or 6274819 counting only the distinct ones).

The product of its (nonzero) digits is 327680, while the sum is 46.

The spelling of 20581248880 in words is "twenty billion, five hundred eighty-one million, two hundred forty-eight thousand, eight hundred eighty".