218020812 has 24 divisors (see below), whose sum is σ = 517339200. Its totient is φ = 71441616.

The previous prime is 218020807. The next prime is 218020889.

218020812 is nontrivially palindromic in base 10.

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, 153262 + ... + 154677.

It is an arithmetic number, because the mean of its divisors is an integer number (21555800).

Almost surely, 2^218020812 is an apocalyptic number.

It is an amenable number.

218020812 is an abundant number, since it is smaller than the sum of its proper divisors (299318388).

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

218020812 is a wasteful number, since it uses less digits than its factorization.

218020812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308005 (or 308003 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 218020812 is about 14765.5278266644. The cubic root of 218020812 is about 601.8653171990.

The spelling of 218020812 in words is "two hundred eighteen million, twenty thousand, eight hundred twelve".