220424 has 16 divisors (see below), whose sum is σ = 421200. Its totient is φ = 108112.
The previous prime is 220421. The next prime is 220447. The reversal of 220424 is 424022.
It is a happy number.
220424 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is an Ulam number.
It is a junction number, because it is equal to n+sod(n) for n = 220399 and 220408.
It is not an unprimeable number, because it can be changed into a prime (220421) 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, 239 + ... + 705.
It is an arithmetic number, because the mean of its divisors is an integer number (26325).
2220424 is an apocalyptic number.
It is an amenable number.
220424 is a deficient number, since it is larger than the sum of its proper divisors (200776).
220424 is a wasteful number, since it uses less digits than its factorization.
220424 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 532 (or 528 counting only the distinct ones).
The product of its (nonzero) digits is 128, while the sum is 14.
The square root of 220424 is about 469.4933439358. The cubic root of 220424 is about 60.4068644158.
Adding to 220424 its reverse (424022), we get a palindrome (644446).
The spelling of 220424 in words is "two hundred twenty thousand, four hundred twenty-four", and thus it is an iban number.
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