20369 has 2 divisors, whose sum is σ = 20370. Its totient is φ = 20368.
The previous prime is 20359. The next prime is 20389. The reversal of 20369 is 96302.
It is a happy number.
It is an a-pointer prime, because the next prime (20389) can be obtained adding 20369 to its sum of digits (20).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 18769 + 1600 = 137^2 + 40^2 .
It is a cyclic number.
It is not a de Polignac number, because 20369 - 24 = 20353 is a prime.
It is a super-2 number, since 2×203692 = 829792322, which contains 22 as substring.
It is a Sophie Germain prime.
It is a Chen prime.
It is a Curzon number.
It is a nialpdrome in base 12.
It is a self number, because there is not a number n which added to its sum of digits gives 20369.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20369.
It is not a weakly prime, because it can be changed into another prime (20359) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10184 + 10185.
It is an arithmetic number, because the mean of its divisors is an integer number (10185).
220369 is an apocalyptic number.
It is an amenable number.
20369 is a deficient number, since it is larger than the sum of its proper divisors (1).
20369 is an equidigital number, since it uses as much as digits as its factorization.
20369 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 324, while the sum is 20.
The square root of 20369 is about 142.7200056054. The cubic root of 20369 is about 27.3100965843.
It can be divided in two parts, 203 and 69, that added together give a palindrome (272).
The spelling of 20369 in words is "twenty thousand, three hundred sixty-nine".
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