218394005020 has 24 divisors (see below), whose sum is σ = 459584899200. Its totient is φ = 87175223232.

The previous prime is 218394004963. The next prime is 218394005101. The reversal of 218394005020 is 20500493812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11388855 + ... + 11408014.

It is an arithmetic number, because the mean of its divisors is an integer number (19149370800).

Almost surely, 2^218394005020 is an apocalyptic number.

218394005020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218394005020 is an abundant number, since it is smaller than the sum of its proper divisors (241190894180).

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

218394005020 is a wasteful number, since it uses less digits than its factorization.

218394005020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22797357 (or 22797355 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 218394005020 its reverse (20500493812), we get a palindrome (238894498832).

The spelling of 218394005020 in words is "two hundred eighteen billion, three hundred ninety-four million, five thousand, twenty".