20474221 has 2 divisors, whose sum is σ = 20474222. Its totient is φ = 20474220.

The previous prime is 20474161. The next prime is 20474249. The reversal of 20474221 is 12247402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12145225 + 8328996 = 3485^2 + 2886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20474221 - 2⁹ = 20473709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20474192 and 20474201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20474021) 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 as a sum of consecutive naturals, namely, 10237110 + 10237111.

It is an arithmetic number, because the mean of its divisors is an integer number (10237111).

Almost surely, 2^20474221 is an apocalyptic number.

It is an amenable number.

20474221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20474221 is an equidigital number, since it uses as much as digits as its factorization.

20474221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 20474221 is about 4524.8448592189. The cubic root of 20474221 is about 273.5704148000.

The spelling of 20474221 in words is "twenty million, four hundred seventy-four thousand, two hundred twenty-one".