23221320 has 64 divisors (see below), whose sum is σ = 73768320. Its totient is φ = 5827584.

The previous prime is 23221309. The next prime is 23221327. The reversal of 23221320 is 2312232.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 23221320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23221327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3652 + ... + 7731.

It is an arithmetic number, because the mean of its divisors is an integer number (1152630).

Almost surely, 2^23221320 is an apocalyptic number.

23221320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23221320 is an abundant number, since it is smaller than the sum of its proper divisors (50547000).

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

23221320 is a wasteful number, since it uses less digits than its factorization.

23221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11414 (or 11410 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 23221320 is about 4818.8504853336. The cubic root of 23221320 is about 285.2959683120.

Adding to 23221320 its reverse (2312232), we get a palindrome (25533552).

The spelling of 23221320 in words is "twenty-three million, two hundred twenty-one thousand, three hundred twenty".