20666982 has 32 divisors (see below), whose sum is σ = 47520000. Its totient is φ = 5869728.

The previous prime is 20666963. The next prime is 20666999. The reversal of 20666982 is 28966602.

It is a self number, because there is not a number n which added to its sum of digits gives 20666982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6144 + ... + 8892.

It is an arithmetic number, because the mean of its divisors is an integer number (1485000).

Almost surely, 2^20666982 is an apocalyptic number.

20666982 is an abundant number, since it is smaller than the sum of its proper divisors (26853018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20666982 is a wasteful number, since it uses less digits than its factorization.

20666982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2940.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 20666982 is about 4546.0952475724. The cubic root of 20666982 is about 274.4262727467.

The spelling of 20666982 in words is "twenty million, six hundred sixty-six thousand, nine hundred eighty-two".