217630020 has 24 divisors (see below), whose sum is σ = 609364224. Its totient is φ = 58034656.

The previous prime is 217630001. The next prime is 217630027. The reversal of 217630020 is 20036712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (217630027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1813524 + ... + 1813643.

It is an arithmetic number, because the mean of its divisors is an integer number (25390176).

Almost surely, 2^217630020 is an apocalyptic number.

217630020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217630020 is an abundant number, since it is smaller than the sum of its proper divisors (391734204).

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

217630020 is a wasteful number, since it uses less digits than its factorization.

217630020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627179 (or 3627177 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 217630020 is about 14752.2886360049. The cubic root of 217630020 is about 601.5054970825.

Adding to 217630020 its reverse (20036712), we get a palindrome (237666732).

The spelling of 217630020 in words is "two hundred seventeen million, six hundred thirty thousand, twenty".