20982249 has 6 divisors (see below), whose sum is σ = 30307706. Its totient is φ = 13988160.

The previous prime is 20982239. The next prime is 20982253. The reversal of 20982249 is 94228902.

It can be written as a sum of positive squares in only one way, i.e., 12531600 + 8450649 = 3540^2 + 2907^2 .

It is not a de Polignac number, because 20982249 - 2¹⁶ = 20916713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20982239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1165672 + ... + 1165689.

Almost surely, 2^20982249 is an apocalyptic number.

It is an amenable number.

20982249 is a deficient number, since it is larger than the sum of its proper divisors (9325457).

20982249 is a wasteful number, since it uses less digits than its factorization.

20982249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331367 (or 2331364 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20982249 is about 4580.6384926121. The cubic root of 20982249 is about 275.8146597517.

The spelling of 20982249 in words is "twenty million, nine hundred eighty-two thousand, two hundred forty-nine".