20544217 has 4 divisors (see below), whose sum is σ = 20981376. Its totient is φ = 20107060.

The previous prime is 20544203. The next prime is 20544233. The reversal of 20544217 is 71244502.

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 20544217 - 2⁷ = 20544089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20544191 and 20544200.

It is not an unprimeable number, because it can be changed into a prime (20544817) 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, 218509 + ... + 218602.

It is an arithmetic number, because the mean of its divisors is an integer number (5245344).

Almost surely, 2^20544217 is an apocalyptic number.

It is an amenable number.

20544217 is a deficient number, since it is larger than the sum of its proper divisors (437159).

20544217 is an equidigital number, since it uses as much as digits as its factorization.

20544217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437158.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 20544217 is about 4532.5728896511. The cubic root of 20544217 is about 273.8818154061.

Adding to 20544217 its reverse (71244502), we get a palindrome (91788719).

The spelling of 20544217 in words is "twenty million, five hundred forty-four thousand, two hundred seventeen".