23420240 has 20 divisors (see below), whose sum is σ = 54452244. Its totient is φ = 9368064.

The previous prime is 23420239. The next prime is 23420263. The reversal of 23420240 is 4202432.

It can be written as a sum of positive squares in 2 ways, for example, as 11669056 + 11751184 = 3416^2 + 3428^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146297 + ... + 146456.

Almost surely, 2^23420240 is an apocalyptic number.

23420240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23420240 is an abundant number, since it is smaller than the sum of its proper divisors (31032004).

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

23420240 is a wasteful number, since it uses less digits than its factorization.

23420240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292766 (or 292760 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 23420240 is about 4839.4462493141. The cubic root of 23420240 is about 286.1082935455.

Adding to 23420240 its reverse (4202432), we get a palindrome (27622672).

The spelling of 23420240 in words is "twenty-three million, four hundred twenty thousand, two hundred forty".