20709347 has 2 divisors, whose sum is σ = 20709348. Its totient is φ = 20709346.

The previous prime is 20709323. The next prime is 20709391. The reversal of 20709347 is 74390702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20709347 - 2¹⁰ = 20708323 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20709547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10354673 + 10354674.

It is an arithmetic number, because the mean of its divisors is an integer number (10354674).

Almost surely, 2^20709347 is an apocalyptic number.

20709347 is a deficient number, since it is larger than the sum of its proper divisors (1).

20709347 is an equidigital number, since it uses as much as digits as its factorization.

20709347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 20709347 is about 4550.7523553804. The cubic root of 20709347 is about 274.6136591461.

The spelling of 20709347 in words is "twenty million, seven hundred nine thousand, three hundred forty-seven".