20389882 has 4 divisors (see below), whose sum is σ = 30584826. Its totient is φ = 10194940.

The previous prime is 20389879. The next prime is 20389883. The reversal of 20389882 is 28898302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 4076361 = 4039^2 + 2019^2 .

It is not an unprimeable number, because it can be changed into a prime (20389883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5097469 + ... + 5097472.

Almost surely, 2^20389882 is an apocalyptic number.

20389882 is a deficient number, since it is larger than the sum of its proper divisors (10194944).

20389882 is a wasteful number, since it uses less digits than its factorization.

20389882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10194943.

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

The square root of 20389882 is about 4515.5156959089. The cubic root of 20389882 is about 273.1942603371.

The spelling of 20389882 in words is "twenty million, three hundred eighty-nine thousand, eight hundred eighty-two".