20352289 has 2 divisors, whose sum is σ = 20352290. Its totient is φ = 20352288.

The previous prime is 20352259. The next prime is 20352301. The reversal of 20352289 is 98225302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14630625 + 5721664 = 3825^2 + 2392^2 .

It is a cyclic number.

It is not a de Polignac number, because 20352289 - 2⁷ = 20352161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20352289.

It is not a weakly prime, because it can be changed into another prime (20352259) 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, 10176144 + 10176145.

It is an arithmetic number, because the mean of its divisors is an integer number (10176145).

Almost surely, 2^20352289 is an apocalyptic number.

It is an amenable number.

20352289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20352289 is an equidigital number, since it uses as much as digits as its factorization.

20352289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20352289 is about 4511.3511279882. The cubic root of 20352289 is about 273.0262601815.

The spelling of 20352289 in words is "twenty million, three hundred fifty-two thousand, two hundred eighty-nine".