18820571821440 has 128 divisors (see below), whose sum is σ = 60393194892000. Its totient is φ = 4985135726592.

The previous prime is 18820571821399. The next prime is 18820571821523. The reversal of 18820571821440 is 4412817502881.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32607817 + ... + 33179976.

Almost surely, 2^{18820571821440} is an apocalyptic number.

18820571821440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18820571821440 is an abundant number, since it is smaller than the sum of its proper divisors (41572623070560).

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

18820571821440 is a wasteful number, since it uses less digits than its factorization.

18820571821440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65787964 (or 65787952 counting only the distinct ones).

The product of its (nonzero) digits is 1146880, while the sum is 51.

The spelling of 18820571821440 in words is "eighteen trillion, eight hundred twenty billion, five hundred seventy-one million, eight hundred twenty-one thousand, four hundred forty".