220686 has 8 divisors (see below), whose sum is σ = 441384. Its totient is φ = 73560.

The previous prime is 220681. The next prime is 220687. The reversal of 220686 is 686022.

220686 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

220686 is an admirable number.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220686.

It is not an unprimeable number, because it can be changed into a prime (220681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18385 + ... + 18396.

It is an arithmetic number, because the mean of its divisors is an integer number (55173).

2²²⁰⁶⁸⁶ is an apocalyptic number.

220686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

220686 is a wasteful number, since it uses less digits than its factorization.

220686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36786.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 220686 is about 469.7722852617. The cubic root of 220686 is about 60.4307885076.

The spelling of 220686 in words is "two hundred twenty thousand, six hundred eighty-six".