216620 has 12 divisors (see below), whose sum is σ = 454944. Its totient is φ = 86640.

The previous prime is 216617. The next prime is 216641. The reversal of 216620 is 26612.

216620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

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, 5396 + ... + 5435.

It is an arithmetic number, because the mean of its divisors is an integer number (37912).

2²¹⁶⁶²⁰ is an apocalyptic number.

216620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216620 is an abundant number, since it is smaller than the sum of its proper divisors (238324).

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

216620 is a wasteful number, since it uses less digits than its factorization.

216620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10840 (or 10838 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 216620 is about 465.4245373850. The cubic root of 216620 is about 60.0573525680.

The spelling of 216620 in words is "two hundred sixteen thousand, six hundred twenty".