20340354405 has 64 divisors (see below), whose sum is σ = 39757713408. Its totient is φ = 8677194240.

The previous prime is 20340354389. The next prime is 20340354409. The reversal of 20340354405 is 50445304302.

It is not a de Polignac number, because 20340354405 - 2⁴ = 20340354389 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340354409) 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 63 ways as a sum of consecutive naturals, for example, 3699 + ... + 201728.

It is an arithmetic number, because the mean of its divisors is an integer number (621214272).

Almost surely, 2^20340354405 is an apocalyptic number.

It is an amenable number.

20340354405 is a deficient number, since it is larger than the sum of its proper divisors (19417359003).

20340354405 is a wasteful number, since it uses less digits than its factorization.

20340354405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205506.

The product of its (nonzero) digits is 28800, while the sum is 30.

Adding to 20340354405 its reverse (50445304302), we get a palindrome (70785658707).

The spelling of 20340354405 in words is "twenty billion, three hundred forty million, three hundred fifty-four thousand, four hundred five".