23161805 has 32 divisors (see below), whose sum is σ = 30689280. Its totient is φ = 16727040.

The previous prime is 23161793. The next prime is 23161813. The reversal of 23161805 is 50816132.

It is not a de Polignac number, because 23161805 - 2²⁰ = 22113229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260201 + ... + 260289.

It is an arithmetic number, because the mean of its divisors is an integer number (959040).

Almost surely, 2^23161805 is an apocalyptic number.

It is an amenable number.

23161805 is a deficient number, since it is larger than the sum of its proper divisors (7527475).

23161805 is a wasteful number, since it uses less digits than its factorization.

23161805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 23161805 is about 4812.6712956528. The cubic root of 23161805 is about 285.0520270259.

Adding to 23161805 its reverse (50816132), we get a palindrome (73977937).

The spelling of 23161805 in words is "twenty-three million, one hundred sixty-one thousand, eight hundred five".