20236666 has 8 divisors (see below), whose sum is σ = 30525120. Its totient is φ = 10061628.

The previous prime is 20236661. The next prime is 20236673. The reversal of 20236666 is 66663202.

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

It is not an unprimeable number, because it can be changed into a prime (20236661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27906 + ... + 28621.

It is an arithmetic number, because the mean of its divisors is an integer number (3815640).

Almost surely, 2^20236666 is an apocalyptic number.

20236666 is a deficient number, since it is larger than the sum of its proper divisors (10288454).

20236666 is a wasteful number, since it uses less digits than its factorization.

20236666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56708.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 20236666 is about 4498.5182004745. The cubic root of 20236666 is about 272.5082498975.

Adding to 20236666 its reverse (66663202), we get a palindrome (86899868).

It can be divided in two parts, 20236 and 666, that added together give a palindrome (20902).

The spelling of 20236666 in words is "twenty million, two hundred thirty-six thousand, six hundred sixty-six".