23409220 has 12 divisors (see below), whose sum is σ = 49159404. Its totient is φ = 9363680.

The previous prime is 23409203. The next prime is 23409223. The reversal of 23409220 is 2290432.

It can be written as a sum of positive squares in 2 ways, for example, as 11957764 + 11451456 = 3458^2 + 3384^2 .

It is a junction number, because it is equal to n+sod(n) for n = 23409191 and 23409200.

It is not an unprimeable number, because it can be changed into a prime (23409223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 585211 + ... + 585250.

It is an arithmetic number, because the mean of its divisors is an integer number (4096617).

Almost surely, 2^23409220 is an apocalyptic number.

23409220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23409220 is an abundant number, since it is smaller than the sum of its proper divisors (25750184).

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

23409220 is a wasteful number, since it uses less digits than its factorization.

23409220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170470 (or 1170468 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 23409220 is about 4838.3075553338. The cubic root of 23409220 is about 286.0634120236.

Adding to 23409220 its reverse (2290432), we get a palindrome (25699652).

The spelling of 23409220 in words is "twenty-three million, four hundred nine thousand, two hundred twenty".