20974166 has 8 divisors (see below), whose sum is σ = 32476224. Its totient is φ = 10148760.

The previous prime is 20974159. The next prime is 20974169. The reversal of 20974166 is 66147902.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20974169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169085 + ... + 169208.

It is an arithmetic number, because the mean of its divisors is an integer number (4059528).

Almost surely, 2^20974166 is an apocalyptic number.

20974166 is a deficient number, since it is larger than the sum of its proper divisors (11502058).

20974166 is a wasteful number, since it uses less digits than its factorization.

20974166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338326.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20974166 is about 4579.7561070433. The cubic root of 20974166 is about 275.7792378063.

The spelling of 20974166 in words is "twenty million, nine hundred seventy-four thousand, one hundred sixty-six".