23041640 has 16 divisors (see below), whose sum is σ = 51843780. Its totient is φ = 9216640.

The previous prime is 23041633. The next prime is 23041643. The reversal of 23041640 is 4614032.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19589476 + 3452164 = 4426^2 + 1858^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (23041643) 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, 287981 + ... + 288060.

Almost surely, 2^23041640 is an apocalyptic number.

23041640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23041640 is an abundant number, since it is smaller than the sum of its proper divisors (28802140).

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

23041640 is a wasteful number, since it uses less digits than its factorization.

23041640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576052 (or 576048 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 23041640 is about 4800.1708302934. The cubic root of 23041640 is about 284.5582157095.

Adding to 23041640 its reverse (4614032), we get a palindrome (27655672).

The spelling of 23041640 in words is "twenty-three million, forty-one thousand, six hundred forty".