20974666 has 16 divisors (see below), whose sum is σ = 33000768. Its totient is φ = 9979200.

The previous prime is 20974663. The next prime is 20974687. The reversal of 20974666 is 66647902.

It is a super-2 number, since 2×20974666² = 879873227623112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20974663) 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 in 7 ways as a sum of consecutive naturals, for example, 8626 + ... + 10786.

It is an arithmetic number, because the mean of its divisors is an integer number (2062548).

Almost surely, 2^20974666 is an apocalyptic number.

20974666 is a deficient number, since it is larger than the sum of its proper divisors (12026102).

20974666 is a wasteful number, since it uses less digits than its factorization.

20974666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 20974666 is about 4579.8106947777. The cubic root of 20974666 is about 275.7814292088.

The spelling of 20974666 in words is "twenty million, nine hundred seventy-four thousand, six hundred sixty-six".