20394571 has 2 divisors, whose sum is σ = 20394572. Its totient is φ = 20394570.

The previous prime is 20394547. The next prime is 20394601. The reversal of 20394571 is 17549302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20394571 - 2⁷ = 20394443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20391571) 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, 10197285 + 10197286.

It is an arithmetic number, because the mean of its divisors is an integer number (10197286).

Almost surely, 2^20394571 is an apocalyptic number.

20394571 is a deficient number, since it is larger than the sum of its proper divisors (1).

20394571 is an equidigital number, since it uses as much as digits as its factorization.

20394571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20394571 is about 4516.0348758618. The cubic root of 20394571 is about 273.2152006202.

The spelling of 20394571 in words is "twenty million, three hundred ninety-four thousand, five hundred seventy-one".