20856323 has 8 divisors (see below), whose sum is σ = 21470400. Its totient is φ = 20251048.

The previous prime is 20856317. The next prime is 20856347. The reversal of 20856323 is 32365802.

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 20856323 - 2⁶ = 20856259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20856383) 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 7 ways as a sum of consecutive naturals, for example, 2768 + ... + 7026.

It is an arithmetic number, because the mean of its divisors is an integer number (2683800).

Almost surely, 2^20856323 is an apocalyptic number.

20856323 is a deficient number, since it is larger than the sum of its proper divisors (614077).

20856323 is an equidigital number, since it uses as much as digits as its factorization.

20856323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4401.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20856323 is about 4566.8723433002. The cubic root of 20856323 is about 275.2617804766.

The spelling of 20856323 in words is "twenty million, eight hundred fifty-six thousand, three hundred twenty-three".