23207220 has 72 divisors (see below), whose sum is σ = 72683520. Its totient is φ = 5987520.

The previous prime is 23207203. The next prime is 23207231. The reversal of 23207220 is 2270232.

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 = 23207193 and 23207202.

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 23 ways as a sum of consecutive naturals, for example, 3501 + ... + 7659.

Almost surely, 2^23207220 is an apocalyptic number.

23207220 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 23207220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36341760).

23207220 is an abundant number, since it is smaller than the sum of its proper divisors (49476300).

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

23207220 is a wasteful number, since it uses less digits than its factorization.

23207220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4205 (or 4200 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 23207220 is about 4817.3872586704. The cubic root of 23207220 is about 285.2382126573.

Adding to 23207220 its reverse (2270232), we get a palindrome (25477452).

The spelling of 23207220 in words is "twenty-three million, two hundred seven thousand, two hundred twenty".