23120540 has 24 divisors (see below), whose sum is σ = 50228640. Its totient is φ = 8929088.

The previous prime is 23120501. The next prime is 23120551. The reversal of 23120540 is 4502132.

23120540 = 193² + 194² + ... + 424².

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, 19352 + ... + 20511.

It is an arithmetic number, because the mean of its divisors is an integer number (2092860).

Almost surely, 2^23120540 is an apocalyptic number.

23120540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23120540 is an abundant number, since it is smaller than the sum of its proper divisors (27108100).

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

23120540 is a wasteful number, since it uses less digits than its factorization.

23120540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39901 (or 39899 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 23120540 is about 4808.3822643380. The cubic root of 23120540 is about 284.8826437925.

Adding to 23120540 its reverse (4502132), we get a palindrome (27622672).

It can be divided in two parts, 231 and 20540, that multiplied together give a triangular number (4744740 = T₃₀₈₀).

The spelling of 23120540 in words is "twenty-three million, one hundred twenty thousand, five hundred forty".