23605 has 4 divisors (see below), whose sum is σ = 28332. Its totient is φ = 18880.

The previous prime is 23603. The next prime is 23609. The reversal of 23605 is 50632.

23605 = 44² + 45² + ... + 53².

23605 is nontrivially palindromic in base 4 and base 8.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10609 + 12996 = 103^2 + 114^2 .

It is not a de Polignac number, because 23605 - 2¹ = 23603 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2356 + ... + 2365.

It is an arithmetic number, because the mean of its divisors is an integer number (7083).

2²³⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

23605 is a deficient number, since it is larger than the sum of its proper divisors (4727).

23605 is an equidigital number, since it uses as much as digits as its factorization.

23605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4726.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 23605 is about 153.6391877094. The cubic root of 23605 is about 28.6858683924.

The spelling of 23605 in words is "twenty-three thousand, six hundred five".