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220881 = 3176171
BaseRepresentation
bin110101111011010001
3102012222210
4311323101
524032011
64422333
71606653
oct657321
9365883
10220881
11140a51
12a79a9
13796cb
145a6d3
15456a6
hex35ed1

220881 has 16 divisors (see below), whose sum is σ = 321408. Its totient is φ = 134400.

The previous prime is 220879. The next prime is 220889. The reversal of 220881 is 188022.

It is not a de Polignac number, because 220881 - 21 = 220879 is a prime.

It is a super-2 number, since 2×2208812 = 97576832322, which contains 22 as substring.

It is an Ulam number.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220889) 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 15 ways as a sum of consecutive naturals, for example, 3076 + ... + 3146.

It is an arithmetic number, because the mean of its divisors is an integer number (20088).

2220881 is an apocalyptic number.

It is an amenable number.

220881 is a deficient number, since it is larger than the sum of its proper divisors (100527).

220881 is a wasteful number, since it uses less digits than its factorization.

220881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 220881 is about 469.9797867994. The cubic root of 220881 is about 60.4485823182.

The spelling of 220881 in words is "two hundred twenty thousand, eight hundred eighty-one".

Divisors: 1 3 17 51 61 71 183 213 1037 1207 3111 3621 4331 12993 73627 220881