220549 has 8 divisors (see below), whose sum is σ = 257600. Its totient is φ = 188748.
The previous prime is 220543. The next prime is 220553. The reversal of 220549 is 945022.
It is a happy number.
It is not a de Polignac number, because 220549 - 27 = 220421 is a prime.
It is a super-2 number, since 2×2205492 = 97283722802, which contains 22 as substring.
It is an Ulam number.
It is a nialpdrome in base 12.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (220543) 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, 22 + ... + 664.
It is an arithmetic number, because the mean of its divisors is an integer number (32200).
2220549 is an apocalyptic number.
It is an amenable number.
220549 is a deficient number, since it is larger than the sum of its proper divisors (37051).
220549 is an frugal number, since it uses more digits than its factorization.
220549 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 664 (or 650 counting only the distinct ones).
The product of its (nonzero) digits is 720, while the sum is 22.
The square root of 220549 is about 469.6264472961. The cubic root of 220549 is about 60.4182809451.
The spelling of 220549 in words is "two hundred twenty thousand, five hundred forty-nine".
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