20202881 has 2 divisors, whose sum is σ = 20202882. Its totient is φ = 20202880.

The previous prime is 20202877. The next prime is 20202883. The reversal of 20202881 is 18820202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18627856 + 1575025 = 4316^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202881 - 2² = 20202877 is a prime.

It is a super-2 number, since 2×20202881² = 816312801400322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 20202883, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20202883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101440 + 10101441.

It is an arithmetic number, because the mean of its divisors is an integer number (10101441).

Almost surely, 2^20202881 is an apocalyptic number.

It is an amenable number.

20202881 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202881 is an equidigital number, since it uses as much as digits as its factorization.

20202881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 20202881 is about 4494.7615064651. The cubic root of 20202881 is about 272.3565150962.

The spelling of 20202881 in words is "twenty million, two hundred two thousand, eight hundred eighty-one".