20130605 has 16 divisors (see below), whose sum is σ = 26440128. Its totient is φ = 14592000.

The previous prime is 20130599. The next prime is 20130647. The reversal of 20130605 is 50603102.

It is not a de Polignac number, because 20130605 - 2⁶ = 20130541 is a prime.

It is a super-3 number, since 3×20130605³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31085 + ... + 31725.

It is an arithmetic number, because the mean of its divisors is an integer number (1652508).

Almost surely, 2^20130605 is an apocalyptic number.

It is an amenable number.

20130605 is a deficient number, since it is larger than the sum of its proper divisors (6309523).

20130605 is a wasteful number, since it uses less digits than its factorization.

20130605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 20130605 is about 4486.7142766171. The cubic root of 20130605 is about 272.0313410037.

Adding to 20130605 its reverse (50603102), we get a palindrome (70733707).

The spelling of 20130605 in words is "twenty million, one hundred thirty thousand, six hundred five".