23312220 has 48 divisors (see below), whose sum is σ = 67044768. Its totient is φ = 6048000.

The previous prime is 23312147. The next prime is 23312227. The reversal of 23312220 is 2221332.

23312220 = T₁₁₀₄ + T₁₁₀₅ + ... + T₁₁₄₀.

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 23312220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23312227) 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, 3031 + ... + 7470.

It is an arithmetic number, because the mean of its divisors is an integer number (1396766).

Almost surely, 2^23312220 is an apocalyptic number.

23312220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23312220 is an abundant number, since it is smaller than the sum of its proper divisors (43732548).

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

23312220 is a wasteful number, since it uses less digits than its factorization.

23312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10550 (or 10548 counting only the distinct ones).

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

The square root of 23312220 is about 4828.2729831690. The cubic root of 23312220 is about 285.6677478964.

Adding to 23312220 its reverse (2221332), we get a palindrome (25533552).

It can be divided in two parts, 23312 and 220, that added together give a palindrome (23532).

The spelling of 23312220 in words is "twenty-three million, three hundred twelve thousand, two hundred twenty".