20605349 has 2 divisors, whose sum is σ = 20605350. Its totient is φ = 20605348.

The previous prime is 20605339. The next prime is 20605391. The reversal of 20605349 is 94350602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19936225 + 669124 = 4465^2 + 818^2 .

It is a cyclic number.

It is not a de Polignac number, because 20605349 - 2²⁴ = 3828133 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 (20605339) 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, 10302674 + 10302675.

It is an arithmetic number, because the mean of its divisors is an integer number (10302675).

Almost surely, 2^20605349 is an apocalyptic number.

It is an amenable number.

20605349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20605349 is an equidigital number, since it uses as much as digits as its factorization.

20605349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20605349 is about 4539.3115116722. The cubic root of 20605349 is about 274.1532034339.

The spelling of 20605349 in words is "twenty million, six hundred five thousand, three hundred forty-nine".