20982967 has 4 divisors (see below), whose sum is σ = 20998600. Its totient is φ = 20967336.

The previous prime is 20982961. The next prime is 20982977. The reversal of 20982967 is 76928902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76928902 = 2 ⋅38464451.

It is a cyclic number.

It is not a de Polignac number, because 20982967 - 2¹¹ = 20980919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20982961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5592 + ... + 8557.

It is an arithmetic number, because the mean of its divisors is an integer number (5249650).

Almost surely, 2^20982967 is an apocalyptic number.

20982967 is a deficient number, since it is larger than the sum of its proper divisors (15633).

20982967 is a wasteful number, since it uses less digits than its factorization.

20982967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15632.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 20982967 is about 4580.7168652952. The cubic root of 20982967 is about 275.8178057866.

The spelling of 20982967 in words is "twenty million, nine hundred eighty-two thousand, nine hundred sixty-seven".