20678353 has 2 divisors, whose sum is σ = 20678354. Its totient is φ = 20678352.

The previous prime is 20678351. The next prime is 20678381. The reversal of 20678353 is 35387602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18464209 + 2214144 = 4297^2 + 1488^2 .

It is a cyclic number.

It is not a de Polignac number, because 20678353 - 2¹ = 20678351 is a prime.

Together with 20678351, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20678351) 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, 10339176 + 10339177.

It is an arithmetic number, because the mean of its divisors is an integer number (10339177).

Almost surely, 2^20678353 is an apocalyptic number.

It is an amenable number.

20678353 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678353 is an equidigital number, since it uses as much as digits as its factorization.

20678353 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20678353 is about 4547.3457093122. The cubic root of 20678353 is about 274.4765934147.

The spelling of 20678353 in words is "twenty million, six hundred seventy-eight thousand, three hundred fifty-three".