20210868 has 36 divisors (see below), whose sum is σ = 52338468. Its totient is φ = 6572160.

The previous prime is 20210867. The next prime is 20210881. The reversal of 20210868 is 86801202.

It can be written as a sum of positive squares in 2 ways, for example, as 11985444 + 8225424 = 3462^2 + 2868^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210867) 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 in 11 ways as a sum of consecutive naturals, for example, 5371 + ... + 8322.

Almost surely, 2^20210868 is an apocalyptic number.

It is an amenable number.

20210868 is an abundant number, since it is smaller than the sum of its proper divisors (32127600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20210868 is a wasteful number, since it uses less digits than its factorization.

20210868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13744 (or 13739 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20210868 is about 4495.6498974008. The cubic root of 20210868 is about 272.3924014777.

The spelling of 20210868 in words is "twenty million, two hundred ten thousand, eight hundred sixty-eight".