217287020 has 12 divisors (see below), whose sum is σ = 456302784. Its totient is φ = 86914800.

The previous prime is 217287019. The next prime is 217287043. The reversal of 217287020 is 20782712.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5432156 + ... + 5432195.

It is an arithmetic number, because the mean of its divisors is an integer number (38025232).

Almost surely, 2^217287020 is an apocalyptic number.

217287020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217287020 is an abundant number, since it is smaller than the sum of its proper divisors (239015764).

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

217287020 is a wasteful number, since it uses less digits than its factorization.

217287020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10864360 (or 10864358 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 217287020 is about 14740.6587369764. The cubic root of 217287020 is about 601.1893261331.

The spelling of 217287020 in words is "two hundred seventeen million, two hundred eighty-seven thousand, twenty".