23220730 has 16 divisors (see below), whose sum is σ = 45012744. Its totient is φ = 8573760.

The previous prime is 23220683. The next prime is 23220737. The reversal of 23220730 is 3702232.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18481401 + 4739329 = 4299^2 + 2177^2 .

It is a junction number, because it is equal to n+sod(n) for n = 23220698 and 23220707.

It is not an unprimeable number, because it can be changed into a prime (23220737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89181 + ... + 89440.

Almost surely, 2^23220730 is an apocalyptic number.

23220730 is a deficient number, since it is larger than the sum of its proper divisors (21792014).

23220730 is a wasteful number, since it uses less digits than its factorization.

23220730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178641.

The product of its (nonzero) digits is 504, while the sum is 19.

The square root of 23220730 is about 4818.7892670255. The cubic root of 23220730 is about 285.2935520548.

Adding to 23220730 its reverse (3702232), we get a palindrome (26922962).

The spelling of 23220730 in words is "twenty-three million, two hundred twenty thousand, seven hundred thirty".