20199666 has 8 divisors (see below), whose sum is σ = 40399344. Its totient is φ = 6733220.

The previous prime is 20199659. The next prime is 20199701. The reversal of 20199666 is 66699102.

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

20199666 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, 1683300 + ... + 1683311.

It is an arithmetic number, because the mean of its divisors is an integer number (5049918).

Almost surely, 2^20199666 is an apocalyptic number.

20199666 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.

20199666 is a wasteful number, since it uses less digits than its factorization.

20199666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366616.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 20199666 is about 4494.4038536829. The cubic root of 20199666 is about 272.3420671131.

The spelling of 20199666 in words is "twenty million, one hundred ninety-nine thousand, six hundred sixty-six".