20305361 has 8 divisors (see below), whose sum is σ = 21803904. Its totient is φ = 18840640.

The previous prime is 20305349. The next prime is 20305367. The reversal of 20305361 is 16350302.

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 20305361 - 2¹⁴ = 20288977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20305367) 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, 7205 + ... + 9618.

It is an arithmetic number, because the mean of its divisors is an integer number (2725488).

Almost surely, 2^20305361 is an apocalyptic number.

It is an amenable number.

20305361 is a deficient number, since it is larger than the sum of its proper divisors (1498543).

20305361 is a wasteful number, since it uses less digits than its factorization.

20305361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16911.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 20305361 is about 4506.1470237887. The cubic root of 20305361 is about 272.8162520811.

Adding to 20305361 its reverse (16350302), we get a palindrome (36655663).

The spelling of 20305361 in words is "twenty million, three hundred five thousand, three hundred sixty-one".