20463636409 has 2 divisors, whose sum is σ = 20463636410. Its totient is φ = 20463636408.

The previous prime is 20463636379. The next prime is 20463636461. The reversal of 20463636409 is 90463636402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20342746384 + 120890025 = 142628^2 + 10995^2 .

It is a cyclic number.

It is not a de Polignac number, because 20463636409 - 2²¹ = 20461539257 is a prime.

It is not a weakly prime, because it can be changed into another prime (20463636499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10231818204 + 10231818205.

It is an arithmetic number, because the mean of its divisors is an integer number (10231818205).

Almost surely, 2^20463636409 is an apocalyptic number.

It is an amenable number.

20463636409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20463636409 is an equidigital number, since it uses as much as digits as its factorization.

20463636409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 43.

The spelling of 20463636409 in words is "twenty billion, four hundred sixty-three million, six hundred thirty-six thousand, four hundred nine".