20128766 has 16 divisors (see below), whose sum is σ = 34612704. Its totient is φ = 8600064.

The previous prime is 20128763. The next prime is 20128781. The reversal of 20128766 is 66782102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20128763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2906 + ... + 6978.

It is an arithmetic number, because the mean of its divisors is an integer number (2163294).

Almost surely, 2^20128766 is an apocalyptic number.

20128766 is a deficient number, since it is larger than the sum of its proper divisors (14483938).

20128766 is a wasteful number, since it uses less digits than its factorization.

20128766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4435.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20128766 is about 4486.5093335465. The cubic root of 20128766 is about 272.0230570852.

The spelling of 20128766 in words is "twenty million, one hundred twenty-eight thousand, seven hundred sixty-six".