20130615 has 24 divisors (see below), whose sum is σ = 35043840. Its totient is φ = 10689984.

The previous prime is 20130599. The next prime is 20130647. The reversal of 20130615 is 51603102.

20130615 is a `hidden beast` number, since 20 + 1 + 30 + 615 = 666.

It is not a de Polignac number, because 20130615 - 2⁴ = 20130599 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11274 + ... + 12936.

It is an arithmetic number, because the mean of its divisors is an integer number (1460160).

Almost surely, 2^20130615 is an apocalyptic number.

20130615 is a deficient number, since it is larger than the sum of its proper divisors (14913225).

20130615 is a wasteful number, since it uses less digits than its factorization.

20130615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943 (or 1940 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 20130615 is about 4486.7153910182. The cubic root of 20130615 is about 272.0313860481.

Adding to 20130615 its reverse (51603102), we get a palindrome (71733717).

The spelling of 20130615 in words is "twenty million, one hundred thirty thousand, six hundred fifteen".