20554321 has 2 divisors, whose sum is σ = 20554322. Its totient is φ = 20554320.

The previous prime is 20554319. The next prime is 20554337. The reversal of 20554321 is 12345502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 1718721 = 4340^2 + 1311^2 .

It is a cyclic number.

It is not a de Polignac number, because 20554321 - 2¹ = 20554319 is a prime.

It is a super-2 number, since 2×20554321² = 844960223542082, which contains 22 as substring.

Together with 20554319, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1303483 and since 20554321 and 1303483 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20554292 and 20554301.

It is not a weakly prime, because it can be changed into another prime (20554421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10277160 + 10277161.

It is an arithmetic number, because the mean of its divisors is an integer number (10277161).

Almost surely, 2^20554321 is an apocalyptic number.

It is an amenable number.

20554321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20554321 is an equidigital number, since it uses as much as digits as its factorization.

20554321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20554321 is about 4533.6873513731. The cubic root of 20554321 is about 273.9267079796.

Adding to 20554321 its reverse (12345502), we get a palindrome (32899823).

The spelling of 20554321 in words is "twenty million, five hundred fifty-four thousand, three hundred twenty-one".