20330240405 has 4 divisors (see below), whose sum is σ = 24396288492. Its totient is φ = 16264192320.

The previous prime is 20330240387. The next prime is 20330240459. The reversal of 20330240405 is 50404203302.

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 14579596516 + 5750643889 = 120746^2 + 75833^2 .

It is not a de Polignac number, because 20330240405 - 2⁸ = 20330240149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2033024036 + ... + 2033024045.

It is an arithmetic number, because the mean of its divisors is an integer number (6099072123).

Almost surely, 2^20330240405 is an apocalyptic number.

It is an amenable number.

20330240405 is a deficient number, since it is larger than the sum of its proper divisors (4066048087).

20330240405 is an equidigital number, since it uses as much as digits as its factorization.

20330240405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066048086.

The product of its (nonzero) digits is 2880, while the sum is 23.

Adding to 20330240405 its reverse (50404203302), we get a palindrome (70734443707).

The spelling of 20330240405 in words is "twenty billion, three hundred thirty million, two hundred forty thousand, four hundred five".