20305427 has 2 divisors, whose sum is σ = 20305428. Its totient is φ = 20305426.

The previous prime is 20305421. The next prime is 20305451. The reversal of 20305427 is 72450302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20305427 - 2⁸ = 20305171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20305421) 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, 10152713 + 10152714.

It is an arithmetic number, because the mean of its divisors is an integer number (10152714).

Almost surely, 2^20305427 is an apocalyptic number.

20305427 is a deficient number, since it is larger than the sum of its proper divisors (1).

20305427 is an equidigital number, since it uses as much as digits as its factorization.

20305427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20305427 is about 4506.1543471124. The cubic root of 20305427 is about 272.8165476657.

Adding to 20305427 its reverse (72450302), we get a palindrome (92755729).

The spelling of 20305427 in words is "twenty million, three hundred five thousand, four hundred twenty-seven".