20654213 has 2 divisors, whose sum is σ = 20654214. Its totient is φ = 20654212.

The previous prime is 20654203. The next prime is 20654237. The reversal of 20654213 is 31245602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19909444 + 744769 = 4462^2 + 863^2 .

It is a cyclic number.

It is not a de Polignac number, because 20654213 - 2⁸ = 20653957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20654203) 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, 10327106 + 10327107.

It is an arithmetic number, because the mean of its divisors is an integer number (10327107).

Almost surely, 2^20654213 is an apocalyptic number.

It is an amenable number.

20654213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20654213 is an equidigital number, since it uses as much as digits as its factorization.

20654213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20654213 is about 4544.6906385364. The cubic root of 20654213 is about 274.3697434318.

Adding to 20654213 its reverse (31245602), we get a palindrome (51899815).

The spelling of 20654213 in words is "twenty million, six hundred fifty-four thousand, two hundred thirteen".