20203131031405 has 16 divisors (see below), whose sum is σ = 27773278001280. Its totient is φ = 13820512128192.

The previous prime is 20203131031339. The next prime is 20203131031459. The reversal of 20203131031405 is 50413013130202.

It is a happy number.

It is not a de Polignac number, because 20203131031405 - 2¹⁹ = 20203130507117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20203131031405.

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, 688806714 + ... + 688836043.

It is an arithmetic number, because the mean of its divisors is an integer number (1735829875080).

Almost surely, 2^{20203131031405} is an apocalyptic number.

It is an amenable number.

20203131031405 is a deficient number, since it is larger than the sum of its proper divisors (7570146969875).

20203131031405 is a wasteful number, since it uses less digits than its factorization.

20203131031405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377643188.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 20203131031405 its reverse (50413013130202), we get a palindrome (70616144161607).

The spelling of 20203131031405 in words is "twenty trillion, two hundred three billion, one hundred thirty-one million, thirty-one thousand, four hundred five".