216240020 has 24 divisors (see below), whose sum is σ = 473848704. Its totient is φ = 82735136.

The previous prime is 216239999. The next prime is 216240023. The reversal of 216240020 is 20042612.

216240020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×216240020³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216240023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234584 + ... + 235503.

It is an arithmetic number, because the mean of its divisors is an integer number (19743696).

Almost surely, 2^216240020 is an apocalyptic number.

216240020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216240020 is an abundant number, since it is smaller than the sum of its proper divisors (257608684).

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

216240020 is a wasteful number, since it uses less digits than its factorization.

216240020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470119 (or 470117 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 216240020 is about 14705.1018357575. The cubic root of 216240020 is about 600.2221584733. Note that the first 3 decimals are identical.

Adding to 216240020 its reverse (20042612), we get a palindrome (236282632).

The spelling of 216240020 in words is "two hundred sixteen million, two hundred forty thousand, twenty".