20304421009 has 2 divisors, whose sum is σ = 20304421010. Its totient is φ = 20304421008.

The previous prime is 20304420989. The next prime is 20304421051. The reversal of 20304421009 is 90012440302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16442419984 + 3862001025 = 128228^2 + 62145^2 .

It is a cyclic number.

It is not a de Polignac number, because 20304421009 - 2⁹ = 20304420497 is a prime.

It is not a weakly prime, because it can be changed into another prime (20304421099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152210504 + 10152210505.

It is an arithmetic number, because the mean of its divisors is an integer number (10152210505).

Almost surely, 2^20304421009 is an apocalyptic number.

It is an amenable number.

20304421009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20304421009 is an equidigital number, since it uses as much as digits as its factorization.

20304421009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 20304421009 in words is "twenty billion, three hundred four million, four hundred twenty-one thousand, nine".