20305853 has 4 divisors (see below), whose sum is σ = 20650080. Its totient is φ = 19961628.

The previous prime is 20305843. The next prime is 20305861. The reversal of 20305853 is 35850302.

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 20305853 - 2¹⁰ = 20304829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305823) 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 3 ways as a sum of consecutive naturals, for example, 172025 + ... + 172142.

It is an arithmetic number, because the mean of its divisors is an integer number (5162520).

Almost surely, 2^20305853 is an apocalyptic number.

It is an amenable number.

20305853 is a deficient number, since it is larger than the sum of its proper divisors (344227).

20305853 is an equidigital number, since it uses as much as digits as its factorization.

20305853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344226.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20305853 is about 4506.2016155516. The cubic root of 20305853 is about 272.8184555142.

The spelling of 20305853 in words is "twenty million, three hundred five thousand, eight hundred fifty-three".