23009540 has 24 divisors (see below), whose sum is σ = 48935040. Its totient is φ = 9086688.

The previous prime is 23009521. The next prime is 23009611. The reversal of 23009540 is 4590032.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5702 + ... + 8861.

It is an arithmetic number, because the mean of its divisors is an integer number (2038960).

Almost surely, 2^23009540 is an apocalyptic number.

23009540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23009540 is an abundant number, since it is smaller than the sum of its proper divisors (25925500).

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

23009540 is a wasteful number, since it uses less digits than its factorization.

23009540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14651 (or 14649 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 23009540 is about 4796.8260339520. The cubic root of 23009540 is about 284.4260121022.

Adding to 23009540 its reverse (4590032), we get a palindrome (27599572).

It can be divided in two parts, 2300 and 9540, that multiplied together give a triangular number (21942000 = T₆₆₂₄).

The spelling of 23009540 in words is "twenty-three million, nine thousand, five hundred forty".