9220720 has 20 divisors (see below), whose sum is σ = 21438360. Its totient is φ = 3688256.

The previous prime is 9220711. The next prime is 9220721. The reversal of 9220720 is 270229.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 9220691 and 9220700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9220721) 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, 57550 + ... + 57709.

It is an arithmetic number, because the mean of its divisors is an integer number (1071918).

Almost surely, 2^9220720 is an apocalyptic number.

It is an amenable number.

9220720 is an abundant number, since it is smaller than the sum of its proper divisors (12217640).

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

9220720 is a wasteful number, since it uses less digits than its factorization.

9220720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115272 (or 115266 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 9220720 is about 3036.5638475092. The cubic root of 9220720 is about 209.6950979610.

Adding to 9220720 its reverse (270229), we get a palindrome (9490949).

The spelling of 9220720 in words is "nine million, two hundred twenty thousand, seven hundred twenty".