218620 has 24 divisors (see below), whose sum is σ = 486864. Its totient is φ = 82176.

The previous prime is 218611. The next prime is 218623. The reversal of 218620 is 26812.

It is a happy number.

218620 is nontrivially palindromic in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218623) 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, 19 + ... + 661.

It is an arithmetic number, because the mean of its divisors is an integer number (20286).

2²¹⁸⁶²⁰ is an apocalyptic number.

218620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243432).

218620 is an abundant number, since it is smaller than the sum of its proper divisors (268244).

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

218620 is a wasteful number, since it uses less digits than its factorization.

218620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 218620 is about 467.5681768470. The cubic root of 218620 is about 60.2416182965.

Adding to 218620 its product of nonzero digits (192), we get a palindrome (218812).

It can be divided in two parts, 218 and 620, that added together give a palindrome (838).

The spelling of 218620 in words is "two hundred eighteen thousand, six hundred twenty".