20394547 has 2 divisors, whose sum is σ = 20394548. Its totient is φ = 20394546.

The previous prime is 20394533. The next prime is 20394571. The reversal of 20394547 is 74549302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20394547 - 2¹¹ = 20392499 is a prime.

It is not a weakly prime, because it can be changed into another prime (20394527) 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, 10197273 + 10197274.

It is an arithmetic number, because the mean of its divisors is an integer number (10197274).

Almost surely, 2^20394547 is an apocalyptic number.

20394547 is a deficient number, since it is larger than the sum of its proper divisors (1).

20394547 is an equidigital number, since it uses as much as digits as its factorization.

20394547 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 20394547 is about 4516.0322186627. The cubic root of 20394547 is about 273.2150934484.

The spelling of 20394547 in words is "twenty million, three hundred ninety-four thousand, five hundred forty-seven".