20336881 has 2 divisors, whose sum is σ = 20336882. Its totient is φ = 20336880.

The previous prime is 20336873. The next prime is 20336929. The reversal of 20336881 is 18863302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 1846881 = 4300^2 + 1359^2 .

It is a cyclic number.

It is not a de Polignac number, because 20336881 - 2³ = 20336873 is a prime.

It is a super-3 number, since 3×20336881³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (20336581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10168440 + 10168441.

It is an arithmetic number, because the mean of its divisors is an integer number (10168441).

Almost surely, 2^20336881 is an apocalyptic number.

It is an amenable number.

20336881 is a deficient number, since it is larger than the sum of its proper divisors (1).

20336881 is an equidigital number, since it uses as much as digits as its factorization.

20336881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20336881 is about 4509.6431122651. The cubic root of 20336881 is about 272.9573432705.

The spelling of 20336881 in words is "twenty million, three hundred thirty-six thousand, eight hundred eighty-one".