20282081 has 2 divisors, whose sum is σ = 20282082. Its totient is φ = 20282080.

The previous prime is 20282069. The next prime is 20282083. The reversal of 20282081 is 18028202.

20282081 = 3184² + 3185².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10144225 + 10137856 = 3185^2 + 3184^2 .

It is a cyclic number.

It is not a de Polignac number, because 20282081 - 2¹⁴ = 20265697 is a prime.

It is a super-2 number, since 2×20282081² = 822725619381122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 20282083, 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 (20282083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10141040 + 10141041.

It is an arithmetic number, because the mean of its divisors is an integer number (10141041).

Almost surely, 2^20282081 is an apocalyptic number.

20282081 is the 3185-th centered square number.

It is an amenable number.

20282081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20282081 is an equidigital number, since it uses as much as digits as its factorization.

20282081 is an evil number, because the sum of its binary digits is even.

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

The square root of 20282081 is about 4503.5631448887. The cubic root of 20282081 is about 272.7119513649.

The spelling of 20282081 in words is "twenty million, two hundred eighty-two thousand, eighty-one".