20709323 has 2 divisors, whose sum is σ = 20709324. Its totient is φ = 20709322.

The previous prime is 20709319. The next prime is 20709347. The reversal of 20709323 is 32390702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20709323 - 2² = 20709319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20709292 and 20709301.

It is not a weakly prime, because it can be changed into another prime (20709523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10354661 + 10354662.

It is an arithmetic number, because the mean of its divisors is an integer number (10354662).

Almost surely, 2^20709323 is an apocalyptic number.

20709323 is a deficient number, since it is larger than the sum of its proper divisors (1).

20709323 is an equidigital number, since it uses as much as digits as its factorization.

20709323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 20709323 is about 4550.7497184530. The cubic root of 20709323 is about 274.6135530631.

The spelling of 20709323 in words is "twenty million, seven hundred nine thousand, three hundred twenty-three".