20349347 has 2 divisors, whose sum is σ = 20349348. Its totient is φ = 20349346.

The previous prime is 20349293. The next prime is 20349349. The reversal of 20349347 is 74394302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20349347 - 2⁶ = 20349283 is a prime.

Together with 20349349, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20349349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10174673 + 10174674.

It is an arithmetic number, because the mean of its divisors is an integer number (10174674).

Almost surely, 2^20349347 is an apocalyptic number.

20349347 is a deficient number, since it is larger than the sum of its proper divisors (1).

20349347 is an equidigital number, since it uses as much as digits as its factorization.

20349347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 20349347 is about 4511.0250498085. The cubic root of 20349347 is about 273.0131038896.

The spelling of 20349347 in words is "twenty million, three hundred forty-nine thousand, three hundred forty-seven".