23145540 has 48 divisors (see below), whose sum is σ = 70701120. Its totient is φ = 5610880.

The previous prime is 23145539. The next prime is 23145541. The reversal of 23145540 is 4554132.

It is an interprime number because it is at equal distance from previous prime (23145539) and next prime (23145541).

It is a self number, because there is not a number n which added to its sum of digits gives 23145540.

It is not an unprimeable number, because it can be changed into a prime (23145541) 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, 16875 + ... + 18194.

It is an arithmetic number, because the mean of its divisors is an integer number (1472940).

Almost surely, 2^23145540 is an apocalyptic number.

23145540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23145540 is an abundant number, since it is smaller than the sum of its proper divisors (47555580).

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

23145540 is a wasteful number, since it uses less digits than its factorization.

23145540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35092 (or 35090 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 23145540 is about 4810.9811889052. The cubic root of 23145540 is about 284.9852870213.

Adding to 23145540 its reverse (4554132), we get a palindrome (27699672).

The spelling of 23145540 in words is "twenty-three million, one hundred forty-five thousand, five hundred forty".