20853389 has 2 divisors, whose sum is σ = 20853390. Its totient is φ = 20853388.

The previous prime is 20853377. The next prime is 20853401. The reversal of 20853389 is 98335802.

It is a balanced prime because it is at equal distance from previous prime (20853377) and next prime (20853401).

It can be written as a sum of positive squares in only one way, i.e., 16337764 + 4515625 = 4042^2 + 2125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20853389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20853319) 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, 10426694 + 10426695.

It is an arithmetic number, because the mean of its divisors is an integer number (10426695).

Almost surely, 2^20853389 is an apocalyptic number.

It is an amenable number.

20853389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20853389 is an equidigital number, since it uses as much as digits as its factorization.

20853389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 20853389 is about 4566.5511055938. The cubic root of 20853389 is about 275.2488722259.

The spelling of 20853389 in words is "twenty million, eight hundred fifty-three thousand, three hundred eighty-nine".