15244220 has 12 divisors (see below), whose sum is σ = 32012904. Its totient is φ = 6097680.

The previous prime is 15244211. The next prime is 15244253. The reversal of 15244220 is 2244251.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 762211 = 15244220 / (1 + 5 + 2 + 4 + 4 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 15244192 and 15244201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381086 + ... + 381125.

It is an arithmetic number, because the mean of its divisors is an integer number (2667742).

Almost surely, 2^15244220 is an apocalyptic number.

15244220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15244220 is an abundant number, since it is smaller than the sum of its proper divisors (16768684).

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

15244220 is a wasteful number, since it uses less digits than its factorization.

15244220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762220 (or 762218 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 15244220 is about 3904.3847146510. The cubic root of 15244220 is about 247.9524492600.

Adding to 15244220 its reverse (2244251), we get a palindrome (17488471).

The spelling of 15244220 in words is "fifteen million, two hundred forty-four thousand, two hundred twenty".