20303613 has 24 divisors (see below), whose sum is σ = 32481696. Its totient is φ = 12117600.

The previous prime is 20303599. The next prime is 20303623. The reversal of 20303613 is 31630302.

It is a happy number.

20303613 is a `hidden beast` number, since 20 + 30 + 3 + 613 = 666.

It is not a de Polignac number, because 20303613 - 2⁴ = 20303597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5103 + ... + 8163.

It is an arithmetic number, because the mean of its divisors is an integer number (1353404).

Almost surely, 2^20303613 is an apocalyptic number.

It is an amenable number.

20303613 is a deficient number, since it is larger than the sum of its proper divisors (12178083).

20303613 is a wasteful number, since it uses less digits than its factorization.

20303613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145 (or 3142 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 20303613 is about 4505.9530623388. The cubic root of 20303613 is about 272.8084233359.

Adding to 20303613 its reverse (31630302), we get a palindrome (51933915).

The spelling of 20303613 in words is "twenty million, three hundred three thousand, six hundred thirteen".