20804153 has 4 divisors (see below), whose sum is σ = 20847360. Its totient is φ = 20760948.

The previous prime is 20804149. The next prime is 20804159. The reversal of 20804153 is 35140802.

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 20804153 - 2² = 20804149 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20804159) 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, 20873 + ... + 21846.

It is an arithmetic number, because the mean of its divisors is an integer number (5211840).

Almost surely, 2^20804153 is an apocalyptic number.

It is an amenable number.

20804153 is a deficient number, since it is larger than the sum of its proper divisors (43207).

20804153 is an equidigital number, since it uses as much as digits as its factorization.

20804153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43206.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20804153 is about 4561.1569804163. The cubic root of 20804153 is about 275.0320755974.

Adding to 20804153 its reverse (35140802), we get a palindrome (55944955).

The spelling of 20804153 in words is "twenty million, eight hundred four thousand, one hundred fifty-three".