20303421431 has 4 divisors (see below), whose sum is σ = 20512735152. Its totient is φ = 20094107712.

The previous prime is 20303421427. The next prime is 20303421443. The reversal of 20303421431 is 13412430302.

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 20303421431 - 2² = 20303421427 is a prime.

It is a super-2 number, since 2×20303421431² (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 = 20303421397 and 20303421406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303423431) 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, 104656715 + ... + 104656908.

It is an arithmetic number, because the mean of its divisors is an integer number (5128183788).

Almost surely, 2^20303421431 is an apocalyptic number.

20303421431 is a deficient number, since it is larger than the sum of its proper divisors (209313721).

20303421431 is an equidigital number, since it uses as much as digits as its factorization.

20303421431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209313720.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20303421431 its reverse (13412430302), we get a palindrome (33715851733).

The spelling of 20303421431 in words is "twenty billion, three hundred three million, four hundred twenty-one thousand, four hundred thirty-one".