20494321 has 2 divisors, whose sum is σ = 20494322. Its totient is φ = 20494320.

The previous prime is 20494319. The next prime is 20494343. The reversal of 20494321 is 12349402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 5198400 = 3911^2 + 2280^2 .

It is a cyclic number.

It is not a de Polignac number, because 20494321 - 2¹ = 20494319 is a prime.

Together with 20494319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20494351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247160 + 10247161.

It is an arithmetic number, because the mean of its divisors is an integer number (10247161).

Almost surely, 2^20494321 is an apocalyptic number.

It is an amenable number.

20494321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20494321 is an equidigital number, since it uses as much as digits as its factorization.

20494321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20494321 is about 4527.0653849928. The cubic root of 20494321 is about 273.6599089155.

The spelling of 20494321 in words is "twenty million, four hundred ninety-four thousand, three hundred twenty-one".