23220312 has 64 divisors (see below), whose sum is σ = 60556800. Its totient is φ = 7413120.

The previous prime is 23220289. The next prime is 23220313. The reversal of 23220312 is 21302232.

It is a junction number, because it is equal to n+sod(n) for n = 23220291 and 23220300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23220313) 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, 69987 + ... + 70317.

It is an arithmetic number, because the mean of its divisors is an integer number (946200).

Almost surely, 2^23220312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23220312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30278400).

23220312 is an abundant number, since it is smaller than the sum of its proper divisors (37336488).

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

23220312 is a wasteful number, since it uses less digits than its factorization.

23220312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 452 counting only the distinct ones).

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

The square root of 23220312 is about 4818.7458949399. The cubic root of 23220312 is about 285.2918401732.

Adding to 23220312 its reverse (21302232), we get a palindrome (44522544).

It can be divided in two parts, 23220 and 312, that added together give a palindrome (23532).

The spelling of 23220312 in words is "twenty-three million, two hundred twenty thousand, three hundred twelve".