20411431331 has 4 divisors (see below), whose sum is σ = 20845717152. Its totient is φ = 19977145512.

The previous prime is 20411431301. The next prime is 20411431333. The reversal of 20411431331 is 13313411402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20411431331 is a prime.

It is a super-2 number, since 2×20411431331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20411431297 and 20411431306.

It is not an unprimeable number, because it can be changed into a prime (20411431333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217142840 + ... + 217142933.

It is an arithmetic number, because the mean of its divisors is an integer number (5211429288).

Almost surely, 2^20411431331 is an apocalyptic number.

20411431331 is a deficient number, since it is larger than the sum of its proper divisors (434285821).

20411431331 is an equidigital number, since it uses as much as digits as its factorization.

20411431331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434285820.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20411431331 its reverse (13313411402), we get a palindrome (33724842733).

The spelling of 20411431331 in words is "twenty billion, four hundred eleven million, four hundred thirty-one thousand, three hundred thirty-one".