20302431340243 has 4 divisors (see below), whose sum is σ = 21864156827968. Its totient is φ = 18740705852520.

The previous prime is 20302431340201. The next prime is 20302431340297. The reversal of 20302431340243 is 34204313420302.

It is a happy number.

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 20302431340243 - 2²⁹ = 20301894469331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20302431346243) 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, 780862743843 + ... + 780862743868.

It is an arithmetic number, because the mean of its divisors is an integer number (5466039206992).

Almost surely, 2^{20302431340243} is an apocalyptic number.

20302431340243 is a deficient number, since it is larger than the sum of its proper divisors (1561725487725).

20302431340243 is a wasteful number, since it uses less digits than its factorization.

20302431340243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561725487724.

The product of its (nonzero) digits is 41472, while the sum is 31.

Adding to 20302431340243 its reverse (34204313420302), we get a palindrome (54506744760545).

The spelling of 20302431340243 in words is "twenty trillion, three hundred two billion, four hundred thirty-one million, three hundred forty thousand, two hundred forty-three".