20305063 has 2 divisors, whose sum is σ = 20305064. Its totient is φ = 20305062.

The previous prime is 20305049. The next prime is 20305079. The reversal of 20305063 is 36050302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20305063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20305063.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20305003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152531 + 10152532.

It is an arithmetic number, because the mean of its divisors is an integer number (10152532).

Almost surely, 2^20305063 is an apocalyptic number.

20305063 is a deficient number, since it is larger than the sum of its proper divisors (1).

20305063 is an equidigital number, since it uses as much as digits as its factorization.

20305063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 20305063 is about 4506.1139577245. The cubic root of 20305063 is about 272.8149174641.

Adding to 20305063 its reverse (36050302), we get a palindrome (56355365).

The spelling of 20305063 in words is "twenty million, three hundred five thousand, sixty-three".