20130913 has 4 divisors (see below), whose sum is σ = 21961008. Its totient is φ = 18300820.

The previous prime is 20130881. The next prime is 20130931. The reversal of 20130913 is 31903102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20130913 - 2⁵ = 20130881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20130983) by changing a digit.

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, 915031 + ... + 915052.

It is an arithmetic number, because the mean of its divisors is an integer number (5490252).

Almost surely, 2^20130913 is an apocalyptic number.

It is an amenable number.

20130913 is a deficient number, since it is larger than the sum of its proper divisors (1830095).

20130913 is a wasteful number, since it uses less digits than its factorization.

20130913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830094.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 20130913 is about 4486.7486000444. The cubic root of 20130913 is about 272.0327283643.

The spelling of 20130913 in words is "twenty million, one hundred thirty thousand, nine hundred thirteen".