217065220 has 24 divisors (see below), whose sum is σ = 458136000. Its totient is φ = 86388192.

The previous prime is 217065151. The next prime is 217065239. The reversal of 217065220 is 22560712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23290 + ... + 31249.

It is an arithmetic number, because the mean of its divisors is an integer number (19089000).

Almost surely, 2^217065220 is an apocalyptic number.

217065220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217065220 is an abundant number, since it is smaller than the sum of its proper divisors (241070780).

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

217065220 is a wasteful number, since it uses less digits than its factorization.

217065220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54747 (or 54745 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 217065220 is about 14733.1334073917. The cubic root of 217065220 is about 600.9846978809.

The spelling of 217065220 in words is "two hundred seventeen million, sixty-five thousand, two hundred twenty".