20130109 has 8 divisors (see below), whose sum is σ = 20909880. Its totient is φ = 19362816.

The previous prime is 20130079. The next prime is 20130163. The reversal of 20130109 is 90103102.

It can be written as a sum of positive squares in 4 ways, for example, as 4305625 + 15824484 = 2075^2 + 3978^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20130109 - 2⁷ = 20129981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20130092 and 20130101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130169) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 237 + ... + 6349.

It is an arithmetic number, because the mean of its divisors is an integer number (2613735).

Almost surely, 2^20130109 is an apocalyptic number.

It is an amenable number.

20130109 is a deficient number, since it is larger than the sum of its proper divisors (779771).

20130109 is an equidigital number, since it uses as much as digits as its factorization.

20130109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6239.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 20130109 is about 4486.6590019746. The cubic root of 20130109 is about 272.0291067828.

The spelling of 20130109 in words is "twenty million, one hundred thirty thousand, one hundred nine".