20675309 has 2 divisors, whose sum is σ = 20675310. Its totient is φ = 20675308.

The previous prime is 20675273. The next prime is 20675351. The reversal of 20675309 is 90357602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 100 = 4547^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 20675309 - 2¹² = 20671213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20675399) 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, 10337654 + 10337655.

It is an arithmetic number, because the mean of its divisors is an integer number (10337655).

Almost surely, 2^20675309 is an apocalyptic number.

It is an amenable number.

20675309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20675309 is an equidigital number, since it uses as much as digits as its factorization.

20675309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 20675309 is about 4547.0109962480. The cubic root of 20675309 is about 274.4631244544.

The spelling of 20675309 in words is "twenty million, six hundred seventy-five thousand, three hundred nine".