20982388 has 18 divisors (see below), whose sum is σ = 42714546. Its totient is φ = 8992368.

The previous prime is 20982359. The next prime is 20982389. The reversal of 20982388 is 88328902.

It can be written as a sum of positive squares in only one way, i.e., 19820304 + 1162084 = 4452^2 + 1078^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20982388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20982389) 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, 53331 + ... + 53722.

Almost surely, 2^20982388 is an apocalyptic number.

20982388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20982388 is an abundant number, since it is smaller than the sum of its proper divisors (21732158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20982388 is a wasteful number, since it uses less digits than its factorization.

20982388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107071 (or 107062 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 20982388 is about 4580.6536651443. The cubic root of 20982388 is about 275.8152688086.

The spelling of 20982388 in words is "twenty million, nine hundred eighty-two thousand, three hundred eighty-eight".