20311140642631 has 4 divisors (see below), whose sum is σ = 20348272527352. Its totient is φ = 20274008757912.

The previous prime is 20311140642619. The next prime is 20311140642691. The reversal of 20311140642631 is 13624604111302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20311140642631 - 2⁹ = 20311140642119 is a prime.

It is a super-2 number, since 2×20311140642631² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311140642691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18565941540 + ... + 18565942633.

It is an arithmetic number, because the mean of its divisors is an integer number (5087068131838).

Almost surely, 2^{20311140642631} is an apocalyptic number.

20311140642631 is a deficient number, since it is larger than the sum of its proper divisors (37131884721).

20311140642631 is an equidigital number, since it uses as much as digits as its factorization.

20311140642631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37131884720.

The product of its (nonzero) digits is 20736, while the sum is 34.

Adding to 20311140642631 its reverse (13624604111302), we get a palindrome (33935744753933).

The spelling of 20311140642631 in words is "twenty trillion, three hundred eleven billion, one hundred forty million, six hundred forty-two thousand, six hundred thirty-one".