20305133 has 8 divisors (see below), whose sum is σ = 21273600. Its totient is φ = 19354608.

The previous prime is 20305097. The next prime is 20305151. The reversal of 20305133 is 33150302.

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 20305133 - 2¹² = 20301037 is a prime.

It is a super-2 number, since 2×20305133² = 824596852295378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305333) 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, 2141 + ... + 6722.

It is an arithmetic number, because the mean of its divisors is an integer number (2659200).

Almost surely, 2^20305133 is an apocalyptic number.

It is an amenable number.

20305133 is a deficient number, since it is larger than the sum of its proper divisors (968467).

20305133 is an equidigital number, since it uses as much as digits as its factorization.

20305133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8971.

The product of its (nonzero) digits is 270, while the sum is 17.

The square root of 20305133 is about 4506.1217249426. The cubic root of 20305133 is about 272.8152309659.

Adding to 20305133 its reverse (33150302), we get a palindrome (53455435).

The spelling of 20305133 in words is "twenty million, three hundred five thousand, one hundred thirty-three".