20343689 has 2 divisors, whose sum is σ = 20343690. Its totient is φ = 20343688.

The previous prime is 20343677. The next prime is 20343727. The reversal of 20343689 is 98634302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 1982464 = 4285^2 + 1408^2 .

It is a cyclic number.

It is not a de Polignac number, because 20343689 - 2²⁴ = 3566473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20343619) 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 as a sum of consecutive naturals, namely, 10171844 + 10171845.

It is an arithmetic number, because the mean of its divisors is an integer number (10171845).

Almost surely, 2^20343689 is an apocalyptic number.

It is an amenable number.

20343689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20343689 is an equidigital number, since it uses as much as digits as its factorization.

20343689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 20343689 is about 4510.3978760194. The cubic root of 20343689 is about 272.9877983875.

The spelling of 20343689 in words is "twenty million, three hundred forty-three thousand, six hundred eighty-nine".