15223220 has 12 divisors (see below), whose sum is σ = 31968804. Its totient is φ = 6089280.

The previous prime is 15223213. The next prime is 15223283. The reversal of 15223220 is 2232251.

It can be written as a sum of positive squares in 2 ways, for example, as 2421136 + 12802084 = 1556^2 + 3578^2 .

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 3 ways as a sum of consecutive naturals, for example, 380561 + ... + 380600.

It is an arithmetic number, because the mean of its divisors is an integer number (2664067).

Almost surely, 2^15223220 is an apocalyptic number.

15223220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15223220 is an abundant number, since it is smaller than the sum of its proper divisors (16745584).

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

15223220 is a wasteful number, since it uses less digits than its factorization.

15223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761170 (or 761168 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 15223220 is about 3901.6945036740. The cubic root of 15223220 is about 247.8385395449.

Adding to 15223220 its reverse (2232251), we get a palindrome (17455471).

The spelling of 15223220 in words is "fifteen million, two hundred twenty-three thousand, two hundred twenty".