20804353 has 4 divisors (see below), whose sum is σ = 20819968. Its totient is φ = 20788740.

The previous prime is 20804309. The next prime is 20804369. The reversal of 20804353 is 35340802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20804353 - 2¹⁷ = 20673281 is a prime.

It is a super-2 number, since 2×20804353² = 865642207497218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20804053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5601 + ... + 8542.

It is an arithmetic number, because the mean of its divisors is an integer number (5204992).

Almost surely, 2^20804353 is an apocalyptic number.

It is an amenable number.

20804353 is a deficient number, since it is larger than the sum of its proper divisors (15615).

20804353 is a wasteful number, since it uses less digits than its factorization.

20804353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15614.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20804353 is about 4561.1789046254. The cubic root of 20804353 is about 275.0329569317.

The spelling of 20804353 in words is "twenty million, eight hundred four thousand, three hundred fifty-three".