23215205 has 16 divisors (see below), whose sum is σ = 30345840. Its totient is φ = 16946688.

The previous prime is 23215201. The next prime is 23215223. The reversal of 23215205 is 50251232.

It can be written as a sum of positive squares in 8 ways, for example, as 1378276 + 21836929 = 1174^2 + 4673^2 .

It is a cyclic number.

It is not a de Polignac number, because 23215205 - 2² = 23215201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23215201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3779 + ... + 7791.

It is an arithmetic number, because the mean of its divisors is an integer number (1896615).

Almost surely, 2^23215205 is an apocalyptic number.

It is an amenable number.

23215205 is a deficient number, since it is larger than the sum of its proper divisors (7130635).

23215205 is a wasteful number, since it uses less digits than its factorization.

23215205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 23215205 is about 4818.2159561398. The cubic root of 23215205 is about 285.2709232528.

Adding to 23215205 its reverse (50251232), we get a palindrome (73466437).

The spelling of 23215205 in words is "twenty-three million, two hundred fifteen thousand, two hundred five".