220668 has 48 divisors (see below), whose sum is σ = 612864. Its totient is φ = 60480.
The previous prime is 220667. The next prime is 220673. The reversal of 220668 is 866022.
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 pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3073 + ... + 3143.
It is an arithmetic number, because the mean of its divisors is an integer number (12768).
2220668 is an apocalyptic number.
220668 is a gapful number since it is divisible by the number (28) 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 220668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306432).
220668 is an abundant number, since it is smaller than the sum of its proper divisors (392196).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
220668 is a wasteful number, since it uses less digits than its factorization.
220668 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 122 (or 120 counting only the distinct ones).
The product of its (nonzero) digits is 1152, while the sum is 24.
The square root of 220668 is about 469.7531266527. The cubic root of 220668 is about 60.4291454736.
It can be divided in two parts, 220 and 668, that added together give a palindrome (888).
The spelling of 220668 in words is "two hundred twenty thousand, six hundred sixty-eight".
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