23066440 has 32 divisors (see below), whose sum is σ = 52244280. Its totient is φ = 9165312.

The previous prime is 23066431. The next prime is 23066441. The reversal of 23066440 is 4466032.

It can be written as a sum of positive squares in 4 ways, for example, as 10407076 + 12659364 = 3226^2 + 3558^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23066441) 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, 4444 + ... + 8116.

Almost surely, 2^23066440 is an apocalyptic number.

23066440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23066440 is an abundant number, since it is smaller than the sum of its proper divisors (29177840).

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

23066440 is a wasteful number, since it uses less digits than its factorization.

23066440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3841 (or 3837 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 23066440 is about 4802.7533769703. The cubic root of 23066440 is about 284.6602702710.

The spelling of 23066440 in words is "twenty-three million, sixty-six thousand, four hundred forty".