23015240 has 32 divisors (see below), whose sum is σ = 51927480. Its totient is φ = 9180672.

The previous prime is 23015233. The next prime is 23015243. The reversal of 23015240 is 4251032.

It can be written as a sum of positive squares in 4 ways, for example, as 19412836 + 3602404 = 4406^2 + 1898^2 .

It is not an unprimeable number, because it can be changed into a prime (23015243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21764 + ... + 22796.

Almost surely, 2^23015240 is an apocalyptic number.

23015240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23015240 is an abundant number, since it is smaller than the sum of its proper divisors (28912240).

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

23015240 is a wasteful number, since it uses less digits than its factorization.

23015240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601 (or 1597 counting only the distinct ones).

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

The square root of 23015240 is about 4797.4201400336. The cubic root of 23015240 is about 284.4494964833.

Adding to 23015240 its reverse (4251032), we get a palindrome (27266272).

The spelling of 23015240 in words is "twenty-three million, fifteen thousand, two hundred forty".