20204203009 has 2 divisors, whose sum is σ = 20204203010. Its totient is φ = 20204203008.

The previous prime is 20204202983. The next prime is 20204203031. The reversal of 20204203009 is 90030240202.

It is an a-pointer prime, because the next prime (20204203031) can be obtained adding 20204203009 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17187996609 + 3016206400 = 131103^2 + 54920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20204203009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20204203909) 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, 10102101504 + 10102101505.

It is an arithmetic number, because the mean of its divisors is an integer number (10102101505).

Almost surely, 2^20204203009 is an apocalyptic number.

It is an amenable number.

20204203009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20204203009 is an equidigital number, since it uses as much as digits as its factorization.

20204203009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The spelling of 20204203009 in words is "twenty billion, two hundred four million, two hundred three thousand, nine".