20113666 has 8 divisors (see below), whose sum is σ = 31758480. Its totient is φ = 9527508.

The previous prime is 20113651. The next prime is 20113673. The reversal of 20113666 is 66631102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20113666.

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, 264616 + ... + 264691.

It is an arithmetic number, because the mean of its divisors is an integer number (3969810).

Almost surely, 2^20113666 is an apocalyptic number.

20113666 is a deficient number, since it is larger than the sum of its proper divisors (11644814).

20113666 is a wasteful number, since it uses less digits than its factorization.

20113666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529328.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20113666 is about 4484.8261950716. The cubic root of 20113666 is about 271.9550188738.

Adding to 20113666 its reverse (66631102), we get a palindrome (86744768).

The spelling of 20113666 in words is "twenty million, one hundred thirteen thousand, six hundred sixty-six".