20686373 has 2 divisors, whose sum is σ = 20686374. Its totient is φ = 20686372.

The previous prime is 20686363. The next prime is 20686409. The reversal of 20686373 is 37368602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20638849 + 47524 = 4543^2 + 218^2 .

It is a cyclic number.

It is not a de Polignac number, because 20686373 - 2⁴ = 20686357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20686313) 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, 10343186 + 10343187.

It is an arithmetic number, because the mean of its divisors is an integer number (10343187).

Almost surely, 2^20686373 is an apocalyptic number.

It is an amenable number.

20686373 is a deficient number, since it is larger than the sum of its proper divisors (1).

20686373 is an equidigital number, since it uses as much as digits as its factorization.

20686373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20686373 is about 4548.2274569331. The cubic root of 20686373 is about 274.5120736381.

The spelling of 20686373 in words is "twenty million, six hundred eighty-six thousand, three hundred seventy-three".