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20306 = 2111371
BaseRepresentation
bin100111101010010
31000212002
410331102
51122211
6234002
7113126
oct47522
930762
1020306
1114290
12b902
139320
147586
15603b
hex4f52

20306 has 16 divisors (see below), whose sum is σ = 36288. Its totient is φ = 8400.

The previous prime is 20297. The next prime is 20323. The reversal of 20306 is 60302.

Adding to 20306 its reverse (60302), we get a palindrome (80608).

It is a happy number.

20306 is nontrivially palindromic in base 5.

It is a Harshad number since it is a multiple of its sum of digits (11).

It is a nialpdrome in base 13.

It is a zygodrome in base 5.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251 + ... + 321.

It is an arithmetic number, because the mean of its divisors is an integer number (2268).

220306 is an apocalyptic number.

20306 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a pronic number, being equal to 142×143.

20306 is a deficient number, since it is larger than the sum of its proper divisors (15982).

20306 is a wasteful number, since it uses less digits than its factorization.

20306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 20306 is about 142.4991228043. The cubic root of 20306 is about 27.2819113850.

The spelling of 20306 in words is "twenty thousand, three hundred six".

Divisors: 1 2 11 13 22 26 71 142 143 286 781 923 1562 1846 10153 20306