15730920 has 96 divisors (see below), whose sum is σ = 52551720. Its totient is φ = 4078080.

The previous prime is 15730909. The next prime is 15730927. The reversal of 15730920 is 2903751.

15730920 is a `hidden beast` number, since 1 + 573 + 0 + 92 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 15729156 + 1764 = 3966^2 + 42^2 .

It is not an unprimeable number, because it can be changed into a prime (15730927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12730 + ... + 13910.

Almost surely, 2^15730920 is an apocalyptic number.

15730920 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 15730920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26275860).

15730920 is an abundant number, since it is smaller than the sum of its proper divisors (36820800).

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

15730920 is a wasteful number, since it uses less digits than its factorization.

15730920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235 (or 1228 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 15730920 is about 3966.2223840829. Note that the first 3 decimals coincide. The cubic root of 15730920 is about 250.5636349742.

The spelling of 15730920 in words is "fifteen million, seven hundred thirty thousand, nine hundred twenty".