20134309 has 4 divisors (see below), whose sum is σ = 21683116. Its totient is φ = 18585504.

The previous prime is 20134291. The next prime is 20134313. The reversal of 20134309 is 90343102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10660225 + 9474084 = 3265^2 + 3078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20134309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20134309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20134369) 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, 774384 + ... + 774409.

It is an arithmetic number, because the mean of its divisors is an integer number (5420779).

Almost surely, 2^20134309 is an apocalyptic number.

It is an amenable number.

20134309 is a deficient number, since it is larger than the sum of its proper divisors (1548807).

20134309 is a wasteful number, since it uses less digits than its factorization.

20134309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548806.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20134309 is about 4487.1270318546. The cubic root of 20134309 is about 272.0480244283.

The spelling of 20134309 in words is "twenty million, one hundred thirty-four thousand, three hundred nine".