20305049 has 2 divisors, whose sum is σ = 20305050. Its totient is φ = 20305048.

The previous prime is 20305039. The next prime is 20305063. The reversal of 20305049 is 94050302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19891600 + 413449 = 4460^2 + 643^2 .

It is a cyclic number.

It is not a de Polignac number, because 20305049 - 2¹² = 20300953 is a prime.

It is not a weakly prime, because it can be changed into another prime (20305039) 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, 10152524 + 10152525.

It is an arithmetic number, because the mean of its divisors is an integer number (10152525).

Almost surely, 2^20305049 is an apocalyptic number.

It is an amenable number.

20305049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20305049 is an equidigital number, since it uses as much as digits as its factorization.

20305049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20305049 is about 4506.1124042793. The cubic root of 20305049 is about 272.8148547637.

The spelling of 20305049 in words is "twenty million, three hundred five thousand, forty-nine".