23240280 has 128 divisors (see below), whose sum is σ = 80985600. Its totient is φ = 5225472.

The previous prime is 23240279. The next prime is 23240291. The reversal of 23240280 is 8204232.

It is a super-2 number, since 2×23240280² = 1080221228956800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61131 + ... + 61509.

It is an arithmetic number, because the mean of its divisors is an integer number (632700).

Almost surely, 2^23240280 is an apocalyptic number.

23240280 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 23240280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40492800).

23240280 is an abundant number, since it is smaller than the sum of its proper divisors (57745320).

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

23240280 is a wasteful number, since it uses less digits than its factorization.

23240280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 23240280 is about 4820.8173580836. The cubic root of 23240280 is about 285.3735943906.

The spelling of 23240280 in words is "twenty-three million, two hundred forty thousand, two hundred eighty".