20109766 has 8 divisors (see below), whose sum is σ = 30546720. Its totient is φ = 9927528.

The previous prime is 20109757. The next prime is 20109773. The reversal of 20109766 is 66790102.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 63481 + ... + 63796.

It is an arithmetic number, because the mean of its divisors is an integer number (3818340).

Almost surely, 2^20109766 is an apocalyptic number.

20109766 is a deficient number, since it is larger than the sum of its proper divisors (10436954).

20109766 is a wasteful number, since it uses less digits than its factorization.

20109766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127358.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20109766 is about 4484.3913745346. The cubic root of 20109766 is about 271.9374405578.

Adding to 20109766 its reverse (66790102), we get a palindrome (86899868).

The spelling of 20109766 in words is "twenty million, one hundred nine thousand, seven hundred sixty-six".