20971018 has 8 divisors (see below), whose sum is σ = 31615200. Its totient is φ = 10432620.

The previous prime is 20970959. The next prime is 20971021. The reversal of 20971018 is 81017902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25948 + ... + 26743.

It is an arithmetic number, because the mean of its divisors is an integer number (3951900).

Almost surely, 2^20971018 is an apocalyptic number.

20971018 is a deficient number, since it is larger than the sum of its proper divisors (10644182).

20971018 is a wasteful number, since it uses less digits than its factorization.

20971018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52892.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 20971018 is about 4579.4124077222. The cubic root of 20971018 is about 275.7654399358.

The spelling of 20971018 in words is "twenty million, nine hundred seventy-one thousand, eighteen".