20498221 has 6 divisors (see below), whose sum is σ = 21428750. Its totient is φ = 19606488.

The previous prime is 20498201. The next prime is 20498239. The reversal of 20498221 is 12289402.

It can be written as a sum of positive squares in only one way, i.e., 17522596 + 2975625 = 4186^2 + 1725^2 .

It is not a de Polignac number, because 20498221 - 2⁵ = 20498189 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 20498221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20498201) 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 5 ways as a sum of consecutive naturals, for example, 18846 + ... + 19903.

Almost surely, 2^20498221 is an apocalyptic number.

It is an amenable number.

20498221 is a deficient number, since it is larger than the sum of its proper divisors (930529).

20498221 is an equidigital number, since it uses as much as digits as its factorization.

20498221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38795 (or 38772 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20498221 is about 4527.4961071215. The cubic root of 20498221 is about 273.6772666663.

The spelling of 20498221 in words is "twenty million, four hundred ninety-eight thousand, two hundred twenty-one".