18784221531020 has 48 divisors (see below), whose sum is σ = 43033249728000. Its totient is φ = 6830577462720.

The previous prime is 18784221531007. The next prime is 18784221531059. The reversal of 18784221531020 is 2013512248781.

It is a super-3 number, since 3×18784221531020³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

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 15 ways as a sum of consecutive naturals, for example, 48572381 + ... + 48957579.

It is an arithmetic number, because the mean of its divisors is an integer number (896526036000).

Almost surely, 2^{18784221531020} is an apocalyptic number.

18784221531020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18784221531020 is an abundant number, since it is smaller than the sum of its proper divisors (24249028196980).

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

18784221531020 is a wasteful number, since it uses less digits than its factorization.

18784221531020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606878 (or 606876 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 18784221531020 in words is "eighteen trillion, seven hundred eighty-four billion, two hundred twenty-one million, five hundred thirty-one thousand, twenty".