20311002431 has 4 divisors (see below), whose sum is σ = 20470931712. Its totient is φ = 20151073152.

The previous prime is 20311002427. The next prime is 20311002443. The reversal of 20311002431 is 13420011302.

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 20311002431 - 2² = 20311002427 is a prime.

It is a super-2 number, since 2×20311002431² (a number of 21 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 (20311002031) 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 3 ways as a sum of consecutive naturals, for example, 79964450 + ... + 79964703.

It is an arithmetic number, because the mean of its divisors is an integer number (5117732928).

Almost surely, 2^20311002431 is an apocalyptic number.

20311002431 is a deficient number, since it is larger than the sum of its proper divisors (159929281).

20311002431 is a wasteful number, since it uses less digits than its factorization.

20311002431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159929280.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20311002431 its reverse (13420011302), we get a palindrome (33731013733).

The spelling of 20311002431 in words is "twenty billion, three hundred eleven million, two thousand, four hundred thirty-one".