20841666 has 8 divisors (see below), whose sum is σ = 41683344. Its totient is φ = 6947220.

The previous prime is 20841659. The next prime is 20841671. The reversal of 20841666 is 66614802.

It is a happy number.

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

20841666 is an admirable number.

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, 1736800 + ... + 1736811.

It is an arithmetic number, because the mean of its divisors is an integer number (5210418).

Almost surely, 2^20841666 is an apocalyptic number.

20841666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20841666 is a wasteful number, since it uses less digits than its factorization.

20841666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3473616.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20841666 is about 4565.2673525216. The cubic root of 20841666 is about 275.1972843302.

The spelling of 20841666 in words is "twenty million, eight hundred forty-one thousand, six hundred sixty-six".