20306613 has 8 divisors (see below), whose sum is σ = 27131328. Its totient is φ = 13509824.

The previous prime is 20306597. The next prime is 20306617. The reversal of 20306613 is 31660302.

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 20306613 - 2⁴ = 20306597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20306613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20306617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5220 + ... + 8237.

It is an arithmetic number, because the mean of its divisors is an integer number (3391416).

Almost surely, 2^20306613 is an apocalyptic number.

It is an amenable number.

20306613 is a deficient number, since it is larger than the sum of its proper divisors (6824715).

20306613 is a wasteful number, since it uses less digits than its factorization.

20306613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13963.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 20306613 is about 4506.2859429912. The cubic root of 20306613 is about 272.8218591214.

Adding to 20306613 its reverse (31660302), we get a palindrome (51966915).

The spelling of 20306613 in words is "twenty million, three hundred six thousand, six hundred thirteen".