20840143317 has 16 divisors (see below), whose sum is σ = 31864801920. Its totient is φ = 11868005952.

The previous prime is 20840143307. The next prime is 20840143319. The reversal of 20840143317 is 71334104802.

It is not a de Polignac number, because 20840143317 - 2⁸ = 20840143061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20840143319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1687342 + ... + 1699647.

It is an arithmetic number, because the mean of its divisors is an integer number (1991550120).

Almost surely, 2^20840143317 is an apocalyptic number.

It is an amenable number.

20840143317 is a deficient number, since it is larger than the sum of its proper divisors (11024658603).

20840143317 is a wasteful number, since it uses less digits than its factorization.

20840143317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387292.

The product of its (nonzero) digits is 16128, while the sum is 33.

The spelling of 20840143317 in words is "twenty billion, eight hundred forty million, one hundred forty-three thousand, three hundred seventeen".