23220513 has 10 divisors (see below), whose sum is σ = 34687554. Its totient is φ = 15480288.

The previous prime is 23220499. The next prime is 23220529. The reversal of 23220513 is 31502232.

It can be written as a sum of positive squares in only one way, i.e., 16548624 + 6671889 = 4068^2 + 2583^2 .

It is not a de Polignac number, because 23220513 - 2⁵ = 23220481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23220563) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 143256 + ... + 143417.

Almost surely, 2^23220513 is an apocalyptic number.

It is an amenable number.

23220513 is a deficient number, since it is larger than the sum of its proper divisors (11467041).

23220513 is an equidigital number, since it uses as much as digits as its factorization.

23220513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286685 (or 286676 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 23220513 is about 4818.7667509436. The cubic root of 23220513 is about 285.2926633533.

Adding to 23220513 its reverse (31502232), we get a palindrome (54722745).

The spelling of 23220513 in words is "twenty-three million, two hundred twenty thousand, five hundred thirteen".