20130709 has 4 divisors (see below), whose sum is σ = 21190240. Its totient is φ = 19071180.

The previous prime is 20130707. The next prime is 20130739. The reversal of 20130709 is 90703102.

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 20130709 - 2¹ = 20130707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20130709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130707) 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 3 ways as a sum of consecutive naturals, for example, 529737 + ... + 529774.

It is an arithmetic number, because the mean of its divisors is an integer number (5297560).

Almost surely, 2^20130709 is an apocalyptic number.

It is an amenable number.

20130709 is a deficient number, since it is larger than the sum of its proper divisors (1059531).

20130709 is a wasteful number, since it uses less digits than its factorization.

20130709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059530.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20130709 is about 4486.7258663752. The cubic root of 20130709 is about 272.0318094647.

The spelling of 20130709 in words is "twenty million, one hundred thirty thousand, seven hundred nine".