23220013 has 4 divisors (see below), whose sum is σ = 23230620. Its totient is φ = 23209408.

The previous prime is 23219983. The next prime is 23220019. The reversal of 23220013 is 31002232.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 21548164 + 1671849 = 4642^2 + 1293^2 .

It is a cyclic number.

It is not a de Polignac number, because 23220013 - 2¹³ = 23211821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23219975 and 23220002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23220019) 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 3 ways as a sum of consecutive naturals, for example, 670 + ... + 6847.

It is an arithmetic number, because the mean of its divisors is an integer number (5807655).

Almost surely, 2^23220013 is an apocalyptic number.

It is an amenable number.

23220013 is a deficient number, since it is larger than the sum of its proper divisors (10607).

23220013 is an equidigital number, since it uses as much as digits as its factorization.

23220013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 23220013 is about 4818.7148701703. The cubic root of 23220013 is about 285.2906156329.

Adding to 23220013 its reverse (31002232), we get a palindrome (54222245).

The spelling of 23220013 in words is "twenty-three million, two hundred twenty thousand, thirteen".