20405335259 has 4 divisors (see below), whose sum is σ = 20414402520. Its totient is φ = 20396268000.

The previous prime is 20405335217. The next prime is 20405335267. The reversal of 20405335259 is 95253350402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20405335259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20405337259) 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, 4530254 + ... + 4534755.

It is an arithmetic number, because the mean of its divisors is an integer number (5103600630).

Almost surely, 2^20405335259 is an apocalyptic number.

20405335259 is a deficient number, since it is larger than the sum of its proper divisors (9067261).

20405335259 is an equidigital number, since it uses as much as digits as its factorization.

20405335259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9067260.

The product of its (nonzero) digits is 162000, while the sum is 38.

The spelling of 20405335259 in words is "twenty billion, four hundred five million, three hundred thirty-five thousand, two hundred fifty-nine".