20402443213343 has 4 divisors (see below), whose sum is σ = 20419718780328. Its totient is φ = 20385167646360.

The previous prime is 20402443213283. The next prime is 20402443213393. The reversal of 20402443213343 is 34331234420402.

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 20402443213343 - 2²⁴ = 20402426436127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402443213393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8637781721 + ... + 8637784082.

It is an arithmetic number, because the mean of its divisors is an integer number (5104929695082).

Almost surely, 2^{20402443213343} is an apocalyptic number.

20402443213343 is a deficient number, since it is larger than the sum of its proper divisors (17275566985).

20402443213343 is a wasteful number, since it uses less digits than its factorization.

20402443213343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17275566984.

The product of its (nonzero) digits is 165888, while the sum is 35.

Adding to 20402443213343 its reverse (34331234420402), we get a palindrome (54733677633745).

The spelling of 20402443213343 in words is "twenty trillion, four hundred two billion, four hundred forty-three million, two hundred thirteen thousand, three hundred forty-three".