15130820 has 12 divisors (see below), whose sum is σ = 31774764. Its totient is φ = 6052320.

The previous prime is 15130807. The next prime is 15130831. The reversal of 15130820 is 2803151.

It can be written as a sum of positive squares in 2 ways, for example, as 9523396 + 5607424 = 3086^2 + 2368^2 .

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: 756541 = 15130820 / (1 + 5 + 1 + 3 + 0 + 8 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 15130792 and 15130801.

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, 378251 + ... + 378290.

It is an arithmetic number, because the mean of its divisors is an integer number (2647897).

Almost surely, 2^15130820 is an apocalyptic number.

15130820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15130820 is an abundant number, since it is smaller than the sum of its proper divisors (16643944).

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

15130820 is a wasteful number, since it uses less digits than its factorization.

15130820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756550 (or 756548 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 15130820 is about 3889.8354720990. The cubic root of 15130820 is about 247.3360884572.

Adding to 15130820 its reverse (2803151), we get a palindrome (17933971).

The spelling of 15130820 in words is "fifteen million, one hundred thirty thousand, eight hundred twenty".