20689343 has 2 divisors, whose sum is σ = 20689344. Its totient is φ = 20689342.

The previous prime is 20689313. The next prime is 20689349. The reversal of 20689343 is 34398602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20689343 - 2⁸ = 20689087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20689349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10344671 + 10344672.

It is an arithmetic number, because the mean of its divisors is an integer number (10344672).

Almost surely, 2^20689343 is an apocalyptic number.

20689343 is a deficient number, since it is larger than the sum of its proper divisors (1).

20689343 is an equidigital number, since it uses as much as digits as its factorization.

20689343 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 20689343 is about 4548.5539460360. The cubic root of 20689343 is about 274.5252104963.

It can be divided in two parts, 2068 and 9343, that added together give a palindrome (11411).

The spelling of 20689343 in words is "twenty million, six hundred eighty-nine thousand, three hundred forty-three".