20982239 has 2 divisors, whose sum is σ = 20982240. Its totient is φ = 20982238.

The previous prime is 20982211. The next prime is 20982253. The reversal of 20982239 is 93228902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20982239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20982199 and 20982208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20982259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10491119 + 10491120.

It is an arithmetic number, because the mean of its divisors is an integer number (10491120).

Almost surely, 2^20982239 is an apocalyptic number.

20982239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20982239 is an equidigital number, since it uses as much as digits as its factorization.

20982239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20982239 is about 4580.6374010611. The cubic root of 20982239 is about 275.8146159345.

The spelling of 20982239 in words is "twenty million, nine hundred eighty-two thousand, two hundred thirty-nine".