20473432064509 has 2 divisors, whose sum is σ = 20473432064510. Its totient is φ = 20473432064508.

The previous prime is 20473432064507. The next prime is 20473432064539. The reversal of 20473432064509 is 90546023437402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13093940288025 + 7379491776484 = 3618555^2 + 2716522^2 .

It is a cyclic number.

It is not a de Polignac number, because 20473432064509 - 2¹ = 20473432064507 is a prime.

It is a super-2 number, since 2×20473432064509² (a number of 27 digits) contains 22 as substring.

Together with 20473432064507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20473432064507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10236716032254 + 10236716032255.

It is an arithmetic number, because the mean of its divisors is an integer number (10236716032255).

Almost surely, 2^{20473432064509} is an apocalyptic number.

It is an amenable number.

20473432064509 is a deficient number, since it is larger than the sum of its proper divisors (1).

20473432064509 is an equidigital number, since it uses as much as digits as its factorization.

20473432064509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 49.

The spelling of 20473432064509 in words is "twenty trillion, four hundred seventy-three billion, four hundred thirty-two million, sixty-four thousand, five hundred nine".