20680266 has 32 divisors (see below), whose sum is σ = 43394688. Its totient is φ = 6557760.

The previous prime is 20680259. The next prime is 20680271. The reversal of 20680266 is 66208602.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 37956 + ... + 38496.

It is an arithmetic number, because the mean of its divisors is an integer number (1356084).

Almost surely, 2^20680266 is an apocalyptic number.

20680266 is an abundant number, since it is smaller than the sum of its proper divisors (22714422).

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

20680266 is a wasteful number, since it uses less digits than its factorization.

20680266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20680266 is about 4547.5560469333. The cubic root of 20680266 is about 274.4850572985.

Adding to 20680266 its reverse (66208602), we get a palindrome (86888868).

The spelling of 20680266 in words is "twenty million, six hundred eighty thousand, two hundred sixty-six".