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220005 = 3254889
BaseRepresentation
bin110101101101100101
3102011210100
4311231211
524020010
64414313
71604262
oct655545
9364710
10220005
11140325
12a7399
13791a6
145a269
15452c0
hex35b65

220005 has 12 divisors (see below), whose sum is σ = 381420. Its totient is φ = 117312.

The previous prime is 219983. The next prime is 220009. The reversal of 220005 is 500022.

It can be written as a sum of positive squares in 2 ways, for example, as 116964 + 103041 = 342^2 + 321^2 .

It is not a de Polignac number, because 220005 - 26 = 219941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2400 + ... + 2489.

It is an arithmetic number, because the mean of its divisors is an integer number (31785).

2220005 is an apocalyptic number.

It is an amenable number.

220005 is a deficient number, since it is larger than the sum of its proper divisors (161415).

220005 is a wasteful number, since it uses less digits than its factorization.

220005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4900 (or 4897 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 9.

The square root of 220005 is about 469.0469059700. The cubic root of 220005 is about 60.3685646987.

Adding to 220005 its reverse (500022), we get a palindrome (720027).

The spelling of 220005 in words is "two hundred twenty thousand, five".

Divisors: 1 3 5 9 15 45 4889 14667 24445 44001 73335 220005