20353213 has 2 divisors, whose sum is σ = 20353214. Its totient is φ = 20353212.

The previous prime is 20353187. The next prime is 20353241. The reversal of 20353213 is 31235302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16499844 + 3853369 = 4062^2 + 1963^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20353213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20353253) 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, 10176606 + 10176607.

It is an arithmetic number, because the mean of its divisors is an integer number (10176607).

Almost surely, 2^20353213 is an apocalyptic number.

It is an amenable number.

20353213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20353213 is an equidigital number, since it uses as much as digits as its factorization.

20353213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 20353213 is about 4511.4535351702. The cubic root of 20353213 is about 273.0303919436.

Adding to 20353213 its reverse (31235302), we get a palindrome (51588515).

The spelling of 20353213 in words is "twenty million, three hundred fifty-three thousand, two hundred thirteen".