15023220 has 96 divisors (see below), whose sum is σ = 44706816. Its totient is φ = 3763200.

The previous prime is 15023219. The next prime is 15023227. The reversal of 15023220 is 2232051.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 15023220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15023227) 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 31 ways as a sum of consecutive naturals, for example, 76162 + ... + 76358.

It is an arithmetic number, because the mean of its divisors is an integer number (465696).

Almost surely, 2^15023220 is an apocalyptic number.

15023220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15023220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22353408).

15023220 is an abundant number, since it is smaller than the sum of its proper divisors (29683596).

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

15023220 is a wasteful number, since it uses less digits than its factorization.

15023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 15023220 is about 3875.9798761087. The cubic root of 15023220 is about 246.7483983681.

Adding to 15023220 its reverse (2232051), we get a palindrome (17255271).

The spelling of 15023220 in words is "fifteen million, twenty-three thousand, two hundred twenty".