20982697 has 4 divisors (see below), whose sum is σ = 21028480. Its totient is φ = 20936916.

The previous prime is 20982683. The next prime is 20982733. The reversal of 20982697 is 79628902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79628902 = 2 ⋅39814451.

It is a cyclic number.

It is not a de Polignac number, because 20982697 - 2⁷ = 20982569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20982677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22197 + ... + 23122.

It is an arithmetic number, because the mean of its divisors is an integer number (5257120).

Almost surely, 2^20982697 is an apocalyptic number.

It is an amenable number.

20982697 is a deficient number, since it is larger than the sum of its proper divisors (45783).

20982697 is an equidigital number, since it uses as much as digits as its factorization.

20982697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45782.

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

The square root of 20982697 is about 4580.6873938308. The cubic root of 20982697 is about 275.8166227457.

The spelling of 20982697 in words is "twenty million, nine hundred eighty-two thousand, six hundred ninety-seven".