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866020 = 225194353
BaseRepresentation
bin11010011011011100100
31121222221211
43103123210
5210203040
630321204
710234561
oct3233344
91558854
10866020
11541721
12359204
1324424c
14187868
151218ea
hexd36e4

866020 has 48 divisors (see below), whose sum is σ = 1995840. Its totient is φ = 314496.

The previous prime is 866011. The next prime is 866029. The reversal of 866020 is 20668.

866020 is nontrivially palindromic in base 3.

It is an interprime number because it is at equal distance from previous prime (866011) and next prime (866029).

It is a junction number, because it is equal to n+sod(n) for n = 865982 and 866000.

It is not an unprimeable number, because it can be changed into a prime (866029) by changing a digit.

866020 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 16314 + ... + 16366.

It is an arithmetic number, because the mean of its divisors is an integer number (41580).

2866020 is an apocalyptic number.

866020 is the 760-th pentagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (997920).

866020 is an abundant number, since it is smaller than the sum of its proper divisors (1129820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866020 is a wasteful number, since it uses less digits than its factorization.

866020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 866020 is about 930.6019557254. The cubic root of 866020 is about 95.3182310448.

Adding to 866020 its reverse (20668), we get a palindrome (886688).

The spelling of 866020 in words is "eight hundred sixty-six thousand, twenty".

Divisors: 1 2 4 5 10 19 20 38 43 53 76 86 95 106 172 190 212 215 265 380 430 530 817 860 1007 1060 1634 2014 2279 3268 4028 4085 4558 5035 8170 9116 10070 11395 16340 20140 22790 43301 45580 86602 173204 216505 433010 866020