20340212505 has 8 divisors (see below), whose sum is σ = 32544340032. Its totient is φ = 10848113328.

The previous prime is 20340212461. The next prime is 20340212509. The reversal of 20340212505 is 50521204302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20340212505 - 2⁶ = 20340212441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20340212509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 678007069 + ... + 678007098.

It is an arithmetic number, because the mean of its divisors is an integer number (4068042504).

Almost surely, 2^20340212505 is an apocalyptic number.

It is an amenable number.

20340212505 is a deficient number, since it is larger than the sum of its proper divisors (12204127527).

20340212505 is a wasteful number, since it uses less digits than its factorization.

20340212505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356014175.

The product of its (nonzero) digits is 2400, while the sum is 24.

Adding to 20340212505 its reverse (50521204302), we get a palindrome (70861416807).

The spelling of 20340212505 in words is "twenty billion, three hundred forty million, two hundred twelve thousand, five hundred five".