20982775 has 24 divisors (see below), whose sum is σ = 29091888. Its totient is φ = 14880000.

The previous prime is 20982763. The next prime is 20982779. The reversal of 20982775 is 57728902.

It is not a de Polignac number, because 20982775 - 2¹¹ = 20980727 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 (20982779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10345 + ... + 12205.

It is an arithmetic number, because the mean of its divisors is an integer number (1212162).

Almost surely, 2^20982775 is an apocalyptic number.

20982775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20982775 is a deficient number, since it is larger than the sum of its proper divisors (8109113).

20982775 is a wasteful number, since it uses less digits than its factorization.

20982775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923 (or 1918 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 20982775 is about 4580.6959078289. The cubic root of 20982775 is about 275.8169645141.

It can be divided in two parts, 209827 and 75, that added together give a palindrome (209902).

The spelling of 20982775 in words is "twenty million, nine hundred eighty-two thousand, seven hundred seventy-five".