20306226509 has 4 divisors (see below), whose sum is σ = 20308312380. Its totient is φ = 20304140640.

The previous prime is 20306226467. The next prime is 20306226511. The reversal of 20306226509 is 90562260302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2849210884 + 17457015625 = 53378^2 + 132125^2 .

It is a cyclic number.

It is not a de Polignac number, because 20306226509 - 2⁸ = 20306226253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20306226209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1028264 + ... + 1047825.

It is an arithmetic number, because the mean of its divisors is an integer number (5077078095).

Almost surely, 2^20306226509 is an apocalyptic number.

It is an amenable number.

20306226509 is a deficient number, since it is larger than the sum of its proper divisors (2085871).

20306226509 is an equidigital number, since it uses as much as digits as its factorization.

20306226509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085870.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 20306226509 in words is "twenty billion, three hundred six million, two hundred twenty-six thousand, five hundred nine".