20842766 has 16 divisors (see below), whose sum is σ = 36697056. Its totient is φ = 8690976.

The previous prime is 20842763. The next prime is 20842817. The reversal of 20842766 is 66724802.

It is a super-3 number, since 3×20842766³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20842763) 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, 19601 + ... + 20636.

It is an arithmetic number, because the mean of its divisors is an integer number (2293566).

Almost surely, 2^20842766 is an apocalyptic number.

20842766 is a deficient number, since it is larger than the sum of its proper divisors (15854290).

20842766 is a wasteful number, since it uses less digits than its factorization.

20842766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40283.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 20842766 is about 4565.3878258041. The cubic root of 20842766 is about 275.2021257807.

The spelling of 20842766 in words is "twenty million, eight hundred forty-two thousand, seven hundred sixty-six".