18420220426832 has 40 divisors (see below), whose sum is σ = 40792552508352. Its totient is φ = 7893427622400.

The previous prime is 18420220426823. The next prime is 18420220426843. The reversal of 18420220426832 is 23862402202481.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8989769 + ... + 10846952.

Almost surely, 2^{18420220426832} is an apocalyptic number.

It is an amenable number.

18420220426832 is an abundant number, since it is smaller than the sum of its proper divisors (22372332081520).

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

18420220426832 is a wasteful number, since it uses less digits than its factorization.

18420220426832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19845027 (or 19845021 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 44.

The spelling of 18420220426832 in words is "eighteen trillion, four hundred twenty billion, two hundred twenty million, four hundred twenty-six thousand, eight hundred thirty-two".