20804317 has 8 divisors (see below), whose sum is σ = 21669120. Its totient is φ = 19951680.

The previous prime is 20804309. The next prime is 20804369. The reversal of 20804317 is 71340802.

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 20804317 - 2³ = 20804309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20804291 and 20804300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20804387) 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, 534 + ... + 6472.

It is an arithmetic number, because the mean of its divisors is an integer number (2708640).

Almost surely, 2^20804317 is an apocalyptic number.

It is an amenable number.

20804317 is a deficient number, since it is larger than the sum of its proper divisors (864803).

20804317 is a wasteful number, since it uses less digits than its factorization.

20804317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20804317 is about 4561.1749582756. The cubic root of 20804317 is about 275.0327982920.

The spelling of 20804317 in words is "twenty million, eight hundred four thousand, three hundred seventeen".