23451320 has 64 divisors (see below), whose sum is σ = 56592000. Its totient is φ = 8719488.

The previous prime is 23451317. The next prime is 23451341. The reversal of 23451320 is 2315432.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 23451292 and 23451301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44579 + ... + 45101.

It is an arithmetic number, because the mean of its divisors is an integer number (884250).

Almost surely, 2^23451320 is an apocalyptic number.

23451320 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 23451320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28296000).

23451320 is an abundant number, since it is smaller than the sum of its proper divisors (33140680).

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

23451320 is a wasteful number, since it uses less digits than its factorization.

23451320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 23451320 is about 4842.6562958773. The cubic root of 23451320 is about 286.2347983003.

Adding to 23451320 its reverse (2315432), we get a palindrome (25766752).

The spelling of 23451320 in words is "twenty-three million, four hundred fifty-one thousand, three hundred twenty".