20967797 has 2 divisors, whose sum is σ = 20967798. Its totient is φ = 20967796.

The previous prime is 20967731. The next prime is 20967799. The reversal of 20967797 is 79776902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17380561 + 3587236 = 4169^2 + 1894^2 .

It is a cyclic number.

It is not a de Polignac number, because 20967797 - 2¹⁰ = 20966773 is a prime.

It is a super-2 number, since 2×20967797² = 879297022066418, which contains 22 as substring.

Together with 20967799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20967799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10483898 + 10483899.

It is an arithmetic number, because the mean of its divisors is an integer number (10483899).

Almost surely, 2^20967797 is an apocalyptic number.

It is an amenable number.

20967797 is a deficient number, since it is larger than the sum of its proper divisors (1).

20967797 is an equidigital number, since it uses as much as digits as its factorization.

20967797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 333396, while the sum is 47.

The square root of 20967797 is about 4579.0607115434. The cubic root of 20967797 is about 275.7513206727.

The spelling of 20967797 in words is "twenty million, nine hundred sixty-seven thousand, seven hundred ninety-seven".