20884973 has 4 divisors (see below), whose sum is σ = 21100380. Its totient is φ = 20669568.

The previous prime is 20884951. The next prime is 20885003. The reversal of 20884973 is 37948802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7327849 + 13557124 = 2707^2 + 3682^2 .

It is a cyclic number.

It is not a de Polignac number, because 20884973 - 2¹² = 20880877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20884973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20884273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107558 + ... + 107751.

It is an arithmetic number, because the mean of its divisors is an integer number (5275095).

Almost surely, 2^20884973 is an apocalyptic number.

It is an amenable number.

20884973 is a deficient number, since it is larger than the sum of its proper divisors (215407).

20884973 is an equidigital number, since it uses as much as digits as its factorization.

20884973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215406.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 20884973 is about 4570.0079868639. The cubic root of 20884973 is about 275.3877637206.

The spelling of 20884973 in words is "twenty million, eight hundred eighty-four thousand, nine hundred seventy-three".