20340709 has 2 divisors, whose sum is σ = 20340710. Its totient is φ = 20340708.

The previous prime is 20340689. The next prime is 20340739. The reversal of 20340709 is 90704302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 2490084 = 4225^2 + 1578^2 .

It is a cyclic number.

It is not a de Polignac number, because 20340709 - 2⁹ = 20340197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20340739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170354 + 10170355.

It is an arithmetic number, because the mean of its divisors is an integer number (10170355).

Almost surely, 2^20340709 is an apocalyptic number.

It is an amenable number.

20340709 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340709 is an equidigital number, since it uses as much as digits as its factorization.

20340709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20340709 is about 4510.0675161243. The cubic root of 20340709 is about 272.9744684000.

The spelling of 20340709 in words is "twenty million, three hundred forty thousand, seven hundred nine".