20854417 has 4 divisors (see below), whose sum is σ = 21298176. Its totient is φ = 20410660.

The previous prime is 20854411. The next prime is 20854429. The reversal of 20854417 is 71445802.

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 20854417 - 2³ = 20854409 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20854411) 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 3 ways as a sum of consecutive naturals, for example, 221809 + ... + 221902.

It is an arithmetic number, because the mean of its divisors is an integer number (5324544).

Almost surely, 2^20854417 is an apocalyptic number.

It is an amenable number.

20854417 is a deficient number, since it is larger than the sum of its proper divisors (443759).

20854417 is an equidigital number, since it uses as much as digits as its factorization.

20854417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443758.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 20854417 is about 4566.6636617995. The cubic root of 20854417 is about 275.2533950909.

The spelling of 20854417 in words is "twenty million, eight hundred fifty-four thousand, four hundred seventeen".