20403313 has 8 divisors (see below), whose sum is σ = 23549760. Its totient is φ = 17314800.

The previous prime is 20403307. The next prime is 20403329. The reversal of 20403313 is 31330402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20403313 - 2⁹ = 20402801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20403353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13723 + ... + 15136.

It is an arithmetic number, because the mean of its divisors is an integer number (2943720).

Almost surely, 2^20403313 is an apocalyptic number.

It is an amenable number.

20403313 is a deficient number, since it is larger than the sum of its proper divisors (3146447).

20403313 is a wasteful number, since it uses less digits than its factorization.

20403313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28967.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 20403313 is about 4517.0026566297. The cubic root of 20403313 is about 273.2542323492.

Adding to 20403313 its reverse (31330402), we get a palindrome (51733715).

The spelling of 20403313 in words is "twenty million, four hundred three thousand, three hundred thirteen".