15730220 has 48 divisors (see below), whose sum is σ = 36384768. Its totient is φ = 5664960.

The previous prime is 15730171. The next prime is 15730249. The reversal of 15730220 is 2203751.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 15730192 and 15730201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27659 + ... + 28221.

It is an arithmetic number, because the mean of its divisors is an integer number (758016).

Almost surely, 2^15730220 is an apocalyptic number.

15730220 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 15730220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18192384).

15730220 is an abundant number, since it is smaller than the sum of its proper divisors (20654548).

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

15730220 is a wasteful number, since it uses less digits than its factorization.

15730220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710 (or 708 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 15730220 is about 3966.1341379232. The cubic root of 15730220 is about 250.5599183628.

Adding to 15730220 its reverse (2203751), we get a palindrome (17933971).

The spelling of 15730220 in words is "fifteen million, seven hundred thirty thousand, two hundred twenty".