20884521 has 8 divisors (see below), whose sum is σ = 31824064. Its totient is φ = 11934000.

The previous prime is 20884511. The next prime is 20884601. The reversal of 20884521 is 12548802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20884521 - 2⁷ = 20884393 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 (20884511) 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 7 ways as a sum of consecutive naturals, for example, 497230 + ... + 497271.

It is an arithmetic number, because the mean of its divisors is an integer number (3978008).

Almost surely, 2^20884521 is an apocalyptic number.

20884521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20884521 is a deficient number, since it is larger than the sum of its proper divisors (10939543).

20884521 is an equidigital number, since it uses as much as digits as its factorization.

20884521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994511.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 20884521 is about 4569.9585337287. The cubic root of 20884521 is about 275.3857770264.

The spelling of 20884521 in words is "twenty million, eight hundred eighty-four thousand, five hundred twenty-one".