20305323 has 12 divisors (see below), whose sum is σ = 30416568. Its totient is φ = 13536720.

The previous prime is 20305321. The next prime is 20305333. The reversal of 20305323 is 32350302.

It is not a de Polignac number, because 20305323 - 2¹ = 20305321 is a prime.

It is a super-2 number, since 2×20305323² = 824612284268658, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20305296 and 20305305.

It is not an unprimeable number, because it can be changed into a prime (20305321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41538 + ... + 42023.

It is an arithmetic number, because the mean of its divisors is an integer number (2534714).

Almost surely, 2^20305323 is an apocalyptic number.

20305323 is a deficient number, since it is larger than the sum of its proper divisors (10111245).

20305323 is an frugal number, since it uses more digits than its factorization.

20305323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83576 (or 83564 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 18.

The square root of 20305323 is about 4506.1428073242. The cubic root of 20305323 is about 272.8160818958.

Adding to 20305323 its reverse (32350302), we get a palindrome (52655625).

The spelling of 20305323 in words is "twenty million, three hundred five thousand, three hundred twenty-three".