20971982 has 16 divisors (see below), whose sum is σ = 33657120. Its totient is φ = 9765888.

The previous prime is 20971969. The next prime is 20971987. The reversal of 20971982 is 28917902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20971987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119 + ... + 6477.

It is an arithmetic number, because the mean of its divisors is an integer number (2103570).

Almost surely, 2^20971982 is an apocalyptic number.

20971982 is a deficient number, since it is larger than the sum of its proper divisors (12685138).

20971982 is a wasteful number, since it uses less digits than its factorization.

20971982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6475.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 20971982 is about 4579.5176601909. The cubic root of 20971982 is about 275.7696653516.

The spelling of 20971982 in words is "twenty million, nine hundred seventy-one thousand, nine hundred eighty-two".