23105640 has 32 divisors (see below), whose sum is σ = 69317280. Its totient is φ = 6161472.

The previous prime is 23105629. The next prime is 23105651. The reversal of 23105640 is 4650132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23105629) and next prime (23105651).

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, 96154 + ... + 96393.

It is an arithmetic number, because the mean of its divisors is an integer number (2166165).

Almost surely, 2^23105640 is an apocalyptic number.

23105640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23105640 is an abundant number, since it is smaller than the sum of its proper divisors (46211640).

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

23105640 is a wasteful number, since it uses less digits than its factorization.

23105640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192561 (or 192557 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 23105640 is about 4806.8326369866. The cubic root of 23105640 is about 284.8214332331.

Adding to 23105640 its reverse (4650132), we get a palindrome (27755772).

The spelling of 23105640 in words is "twenty-three million, one hundred five thousand, six hundred forty".