20403043213313 has 4 divisors (see below), whose sum is σ = 20434578056640. Its totient is φ = 20371508369988.

The previous prime is 20403043213253. The next prime is 20403043213379. The reversal of 20403043213313 is 31331234030402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20403043213313 - 2⁶ = 20403043213249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20403043213213) 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, 15767420693 + ... + 15767421986.

It is an arithmetic number, because the mean of its divisors is an integer number (5108644514160).

Almost surely, 2^{20403043213313} is an apocalyptic number.

It is an amenable number.

20403043213313 is a deficient number, since it is larger than the sum of its proper divisors (31534843327).

20403043213313 is an equidigital number, since it uses as much as digits as its factorization.

20403043213313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31534843326.

The product of its (nonzero) digits is 15552, while the sum is 29.

Adding to 20403043213313 its reverse (31331234030402), we get a palindrome (51734277243715).

The spelling of 20403043213313 in words is "twenty trillion, four hundred three billion, forty-three million, two hundred thirteen thousand, three hundred thirteen".