23661320 has 32 divisors (see below), whose sum is σ = 54247320. Its totient is φ = 9285120.

The previous prime is 23661311. The next prime is 23661343. The reversal of 23661320 is 2316632.

It can be written as a sum of positive squares in 4 ways, for example, as 14577124 + 9084196 = 3818^2 + 3014^2 .

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, 3461 + ... + 7700.

Almost surely, 2^23661320 is an apocalyptic number.

23661320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23661320 is an abundant number, since it is smaller than the sum of its proper divisors (30586000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23661320 is a wasteful number, since it uses less digits than its factorization.

23661320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11225 (or 11221 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 23661320 is about 4864.2902873903. The cubic root of 23661320 is about 287.0866447958.

Adding to 23661320 its reverse (2316632), we get a palindrome (25977952).

The spelling of 23661320 in words is "twenty-three million, six hundred sixty-one thousand, three hundred twenty".