23210220 has 144 divisors (see below), whose sum is σ = 75075840. Its totient is φ = 5343360.

The previous prime is 23210189. The next prime is 23210249. The reversal of 23210220 is 2201232.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 23210196 and 23210205.

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 47 ways as a sum of consecutive naturals, for example, 166911 + ... + 167049.

It is an arithmetic number, because the mean of its divisors is an integer number (521360).

Almost surely, 2^23210220 is an apocalyptic number.

23210220 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 23210220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37537920).

23210220 is an abundant number, since it is smaller than the sum of its proper divisors (51865620).

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

23210220 is a wasteful number, since it uses less digits than its factorization.

23210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 23210220 is about 4817.6986207109. The cubic root of 23210220 is about 285.2505030533.

Adding to 23210220 its reverse (2201232), we get a palindrome (25411452).

The spelling of 23210220 in words is "twenty-three million, two hundred ten thousand, two hundred twenty".