23201540 has 12 divisors (see below), whose sum is σ = 48723276. Its totient is φ = 9280608.

The previous prime is 23201539. The next prime is 23201543. The reversal of 23201540 is 4510232.

It can be written as a sum of positive squares in 2 ways, for example, as 2553604 + 20647936 = 1598^2 + 4544^2 .

It is a super-2 number, since 2×23201540² = 1076622916743200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23201543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580019 + ... + 580058.

It is an arithmetic number, because the mean of its divisors is an integer number (4060273).

Almost surely, 2^23201540 is an apocalyptic number.

23201540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23201540 is an abundant number, since it is smaller than the sum of its proper divisors (25521736).

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

23201540 is a wasteful number, since it uses less digits than its factorization.

23201540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160086 (or 1160084 counting only the distinct ones).

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

The square root of 23201540 is about 4816.7976914128. The cubic root of 23201540 is about 285.2149399396.

Adding to 23201540 its reverse (4510232), we get a palindrome (27711772).

The spelling of 23201540 in words is "twenty-three million, two hundred one thousand, five hundred forty".