23021240 has 32 divisors (see below), whose sum is σ = 56507760. Its totient is φ = 8371200.

The previous prime is 23021237. The next prime is 23021249. The reversal of 23021240 is 4212032.

It is a super-2 number, since 2×23021240² = 1059954982275200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23021249) 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, 25721 + ... + 26600.

Almost surely, 2^23021240 is an apocalyptic number.

23021240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23021240 is an abundant number, since it is smaller than the sum of its proper divisors (33486520).

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

23021240 is a wasteful number, since it uses less digits than its factorization.

23021240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52343 (or 52339 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 23021240 is about 4798.0454353830. The cubic root of 23021240 is about 284.4742126958.

Adding to 23021240 its reverse (4212032), we get a palindrome (27233272).

The spelling of 23021240 in words is "twenty-three million, twenty-one thousand, two hundred forty".