23212220 has 12 divisors (see below), whose sum is σ = 48745704. Its totient is φ = 9284880.

The previous prime is 23212207. The next prime is 23212247. The reversal of 23212220 is 2221232.

It is a junction number, because it is equal to n+sod(n) for n = 23212195 and 23212204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580286 + ... + 580325.

It is an arithmetic number, because the mean of its divisors is an integer number (4062142).

Almost surely, 2^23212220 is an apocalyptic number.

23212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23212220 is an abundant number, since it is smaller than the sum of its proper divisors (25533484).

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

23212220 is a wasteful number, since it uses less digits than its factorization.

23212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160620 (or 1160618 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 23212220 is about 4817.9061842257. The cubic root of 23212220 is about 285.2586960622.

Adding to 23212220 its reverse (2221232), we get a palindrome (25433452).

It can be divided in two parts, 23212 and 220, that added together give a palindrome (23432).

The spelling of 23212220 in words is "twenty-three million, two hundred twelve thousand, two hundred twenty".