20018295304409 has 2 divisors, whose sum is σ = 20018295304410. Its totient is φ = 20018295304408.

The previous prime is 20018295304379. The next prime is 20018295304457. The reversal of 20018295304409 is 90440359281002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13063851216025 + 6954444088384 = 3614395^2 + 2637128^2 .

It is a cyclic number.

It is not a de Polignac number, because 20018295304409 - 2⁸ = 20018295304153 is a prime.

It is not a weakly prime, because it can be changed into another prime (20018265304409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10009147652204 + 10009147652205.

It is an arithmetic number, because the mean of its divisors is an integer number (10009147652205).

Almost surely, 2^{20018295304409} is an apocalyptic number.

It is an amenable number.

20018295304409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20018295304409 is an equidigital number, since it uses as much as digits as its factorization.

20018295304409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 47.

The spelling of 20018295304409 in words is "twenty trillion, eighteen billion, two hundred ninety-five million, three hundred four thousand, four hundred nine".