20971882 has 4 divisors (see below), whose sum is σ = 31457826. Its totient is φ = 10485940.

The previous prime is 20971807. The next prime is 20971889. The reversal of 20971882 is 28817902.

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., 20894041 + 77841 = 4571^2 + 279^2 .

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (20971889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5242969 + ... + 5242972.

Almost surely, 2^20971882 is an apocalyptic number.

20971882 is a deficient number, since it is larger than the sum of its proper divisors (10485944).

20971882 is a wasteful number, since it uses less digits than its factorization.

20971882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10485943.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 20971882 is about 4579.5067419974. The cubic root of 20971882 is about 275.7692270365.

The spelling of 20971882 in words is "twenty million, nine hundred seventy-one thousand, eight hundred eighty-two".