20916323 has 4 divisors (see below), whose sum is σ = 21044808. Its totient is φ = 20787840.

The previous prime is 20916317. The next prime is 20916331. The reversal of 20916323 is 32361902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20916323 - 2¹⁰ = 20915299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20916292 and 20916301.

It is not an unprimeable number, because it can be changed into a prime (20916523) 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 in 3 ways as a sum of consecutive naturals, for example, 63998 + ... + 64323.

It is an arithmetic number, because the mean of its divisors is an integer number (5261202).

Almost surely, 2^20916323 is an apocalyptic number.

20916323 is a deficient number, since it is larger than the sum of its proper divisors (128485).

20916323 is a wasteful number, since it uses less digits than its factorization.

20916323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128484.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 20916323 is about 4573.4366727878. The cubic root of 20916323 is about 275.5254877863.

The spelling of 20916323 in words is "twenty million, nine hundred sixteen thousand, three hundred twenty-three".