20868853 has 2 divisors, whose sum is σ = 20868854. Its totient is φ = 20868852.

The previous prime is 20868847. The next prime is 20868857. The reversal of 20868853 is 35886802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19864849 + 1004004 = 4457^2 + 1002^2 .

It is a cyclic number.

It is not a de Polignac number, because 20868853 - 2¹⁷ = 20737781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20868857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10434426 + 10434427.

It is an arithmetic number, because the mean of its divisors is an integer number (10434427).

Almost surely, 2^20868853 is an apocalyptic number.

It is an amenable number.

20868853 is a deficient number, since it is larger than the sum of its proper divisors (1).

20868853 is an equidigital number, since it uses as much as digits as its factorization.

20868853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 20868853 is about 4568.2439733447. The cubic root of 20868853 is about 275.3168930938.

The spelling of 20868853 in words is "twenty million, eight hundred sixty-eight thousand, eight hundred fifty-three".