20813323 has 2 divisors, whose sum is σ = 20813324. Its totient is φ = 20813322.

The previous prime is 20813311. The next prime is 20813347. The reversal of 20813323 is 32331802.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20813323 - 2⁵ = 20813291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20813294 and 20813303.

It is not a weakly prime, because it can be changed into another prime (20813393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10406661 + 10406662.

It is an arithmetic number, because the mean of its divisors is an integer number (10406662).

Almost surely, 2^20813323 is an apocalyptic number.

20813323 is a deficient number, since it is larger than the sum of its proper divisors (1).

20813323 is an equidigital number, since it uses as much as digits as its factorization.

20813323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20813323 is about 4562.1620970763. The cubic root of 20813323 is about 275.0724789674.

It can be divided in two parts, 208 and 13323, that added together give a palindrome (13531).

The spelling of 20813323 in words is "twenty million, eight hundred thirteen thousand, three hundred twenty-three".