20982277 has 2 divisors, whose sum is σ = 20982278. Its totient is φ = 20982276.

The previous prime is 20982259. The next prime is 20982281. The reversal of 20982277 is 77228902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13147876 + 7834401 = 3626^2 + 2799^2 .

It is a cyclic number.

It is not a de Polignac number, because 20982277 - 2⁷ = 20982149 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20982287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10491138 + 10491139.

It is an arithmetic number, because the mean of its divisors is an integer number (10491139).

Almost surely, 2^20982277 is an apocalyptic number.

It is an amenable number.

20982277 is a deficient number, since it is larger than the sum of its proper divisors (1).

20982277 is an equidigital number, since it uses as much as digits as its factorization.

20982277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 20982277 is about 4580.6415489536. The cubic root of 20982277 is about 275.8147824396.

The spelling of 20982277 in words is "twenty million, nine hundred eighty-two thousand, two hundred seventy-seven".