20936321 has 8 divisors (see below), whose sum is σ = 23962944. Its totient is φ = 17918640.

The previous prime is 20936317. The next prime is 20936329. The reversal of 20936321 is 12363902.

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 20936321 - 2² = 20936317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20936329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3926 + ... + 7568.

It is an arithmetic number, because the mean of its divisors is an integer number (2995368).

Almost surely, 2^20936321 is an apocalyptic number.

It is an amenable number.

20936321 is a deficient number, since it is larger than the sum of its proper divisors (3026623).

20936321 is an equidigital number, since it uses as much as digits as its factorization.

20936321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471.

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

The square root of 20936321 is about 4575.6224713147. The cubic root of 20936321 is about 275.6132693660.

The spelling of 20936321 in words is "twenty million, nine hundred thirty-six thousand, three hundred twenty-one".