23423220 has 72 divisors (see below), whose sum is σ = 72991464. Its totient is φ = 6075648.

The previous prime is 23423209. The next prime is 23423221. The reversal of 23423220 is 2232432.

23423220 is a `hidden beast` number, since 2 + 342 + 322 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13003236 + 10419984 = 3606^2 + 3228^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 23423193 and 23423202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23423221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4902 + ... + 8418.

Almost surely, 2^23423220 is an apocalyptic number.

23423220 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 23423220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36495732).

23423220 is an abundant number, since it is smaller than the sum of its proper divisors (49568244).

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

23423220 is a wasteful number, since it uses less digits than its factorization.

23423220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3569 (or 3564 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 23423220 is about 4839.7541259862. The cubic root of 23423220 is about 286.1204278725.

Adding to 23423220 its reverse (2232432), we get a palindrome (25655652).

The spelling of 23423220 in words is "twenty-three million, four hundred twenty-three thousand, two hundred twenty".