20568766 has 4 divisors (see below), whose sum is σ = 30853152. Its totient is φ = 10284382.

The previous prime is 20568763. The next prime is 20568787. The reversal of 20568766 is 66786502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66786502 = 2 ⋅33393251.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20568761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5142190 + ... + 5142193.

It is an arithmetic number, because the mean of its divisors is an integer number (7713288).

Almost surely, 2^20568766 is an apocalyptic number.

20568766 is a deficient number, since it is larger than the sum of its proper divisors (10284386).

20568766 is a wasteful number, since it uses less digits than its factorization.

20568766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10284385.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 20568766 is about 4535.2801457021. The cubic root of 20568766 is about 273.9908622878.

The spelling of 20568766 in words is "twenty million, five hundred sixty-eight thousand, seven hundred sixty-six".