220664 has 8 divisors (see below), whose sum is σ = 413760. Its totient is φ = 110328.

The previous prime is 220663. The next prime is 220667. The reversal of 220664 is 466022.

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13784 + ... + 13799.

It is an arithmetic number, because the mean of its divisors is an integer number (51720).

2²²⁰⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

220664 is a deficient number, since it is larger than the sum of its proper divisors (193096).

220664 is a wasteful number, since it uses less digits than its factorization.

220664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27589 (or 27585 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 220664 is about 469.7488690779. The cubic root of 220664 is about 60.4287803429.

Adding to 220664 its reverse (466022), we get a palindrome (686686).

It can be divided in two parts, 2 and 20664, that multiplied together give a triangular number (41328 = T₂₈₇).

The spelling of 220664 in words is "two hundred twenty thousand, six hundred sixty-four".