20320420121405 has 16 divisors (see below), whose sum is σ = 24399321111360. Its totient is φ = 16246460641152.

The previous prime is 20320420121399. The next prime is 20320420121411. The reversal of 20320420121405 is 50412102402302.

It is an interprime number because it is at equal distance from previous prime (20320420121399) and next prime (20320420121411).

It is a cyclic number.

It is not a de Polignac number, because 20320420121405 - 2⁴ = 20320420121389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66005042 + ... + 66312188.

It is an arithmetic number, because the mean of its divisors is an integer number (1524957569460).

Almost surely, 2^{20320420121405} is an apocalyptic number.

It is an amenable number.

20320420121405 is a deficient number, since it is larger than the sum of its proper divisors (4078900989955).

20320420121405 is a wasteful number, since it uses less digits than its factorization.

20320420121405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315148.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 20320420121405 its reverse (50412102402302), we get a palindrome (70732522523707).

The spelling of 20320420121405 in words is "twenty trillion, three hundred twenty billion, four hundred twenty million, one hundred twenty-one thousand, four hundred five".