20402343121311 has 12 divisors (see below), whose sum is σ = 29473222505688. Its totient is φ = 13600098389904.

The previous prime is 20402343121301. The next prime is 20402343121327. The reversal of 20402343121311 is 11312134320402.

20402343121311 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 2 + 3 + 431 + 213 + 11 = 666.

It is not a de Polignac number, because 20402343121311 - 2²² = 20402338927007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402343121301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121885965 + ... + 122053238.

It is an arithmetic number, because the mean of its divisors is an integer number (2456101875474).

Almost surely, 2^{20402343121311} is an apocalyptic number.

20402343121311 is a deficient number, since it is larger than the sum of its proper divisors (9070879384377).

20402343121311 is a wasteful number, since it uses less digits than its factorization.

20402343121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243948502 (or 243948499 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 20402343121311 its reverse (11312134320402), we get a palindrome (31714477441713).

The spelling of 20402343121311 in words is "twenty trillion, four hundred two billion, three hundred forty-three million, one hundred twenty-one thousand, three hundred eleven".