23433540 has 72 divisors (see below), whose sum is σ = 71080128. Its totient is φ = 5765760.

The previous prime is 23433523. The next prime is 23433559. The reversal of 23433540 is 4533432.

It is a self number, because there is not a number n which added to its sum of digits gives 23433540.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8985 + ... + 11295.

It is an arithmetic number, because the mean of its divisors is an integer number (987224).

Almost surely, 2^23433540 is an apocalyptic number.

23433540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23433540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35540064).

23433540 is an abundant number, since it is smaller than the sum of its proper divisors (47646588).

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

23433540 is a wasteful number, since it uses less digits than its factorization.

23433540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349 (or 2334 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 24.

The square root of 23433540 is about 4840.8201784408. The cubic root of 23433540 is about 286.1624421540.

Adding to 23433540 its reverse (4533432), we get a palindrome (27966972).

The spelling of 23433540 in words is "twenty-three million, four hundred thirty-three thousand, five hundred forty".