20465112509 has 2 divisors, whose sum is σ = 20465112510. Its totient is φ = 20465112508.

The previous prime is 20465112497. The next prime is 20465112527. The reversal of 20465112509 is 90521156402.

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., 13001016484 + 7464096025 = 114022^2 + 86395^2 .

It is a cyclic number.

It is not a de Polignac number, because 20465112509 - 2⁸ = 20465112253 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20465112599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232556254 + 10232556255.

It is an arithmetic number, because the mean of its divisors is an integer number (10232556255).

Almost surely, 2^20465112509 is an apocalyptic number.

It is an amenable number.

20465112509 is a deficient number, since it is larger than the sum of its proper divisors (1).

20465112509 is an equidigital number, since it uses as much as digits as its factorization.

20465112509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 20465112509 in words is "twenty billion, four hundred sixty-five million, one hundred twelve thousand, five hundred nine".