20841853 has 2 divisors, whose sum is σ = 20841854. Its totient is φ = 20841852.

The previous prime is 20841823. The next prime is 20841857. The reversal of 20841853 is 35814802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20548089 + 293764 = 4533^2 + 542^2 .

It is a cyclic number.

It is not a de Polignac number, because 20841853 - 2⁹ = 20841341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20841857) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420926 + 10420927.

It is an arithmetic number, because the mean of its divisors is an integer number (10420927).

Almost surely, 2^20841853 is an apocalyptic number.

It is an amenable number.

20841853 is a deficient number, since it is larger than the sum of its proper divisors (1).

20841853 is an equidigital number, since it uses as much as digits as its factorization.

20841853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20841853 is about 4565.2878332039. The cubic root of 20841853 is about 275.1981073888.

The spelling of 20841853 in words is "twenty million, eight hundred forty-one thousand, eight hundred fifty-three".