20166786 has 16 divisors (see below), whose sum is σ = 44815200. Its totient is φ = 6722244.

The previous prime is 20166781. The next prime is 20166821. The reversal of 20166786 is 68766102.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20166786.

It is not an unprimeable number, because it can be changed into a prime (20166781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186676 + ... + 186783.

It is an arithmetic number, because the mean of its divisors is an integer number (2800950).

Almost surely, 2^20166786 is an apocalyptic number.

20166786 is an abundant number, since it is smaller than the sum of its proper divisors (24648414).

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

20166786 is a wasteful number, since it uses less digits than its factorization.

20166786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373470 (or 373464 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20166786 is about 4490.7444817090. The cubic root of 20166786 is about 272.1942186258.

The spelling of 20166786 in words is "twenty million, one hundred sixty-six thousand, seven hundred eighty-six".