20776867 has 4 divisors (see below), whose sum is σ = 21218976. Its totient is φ = 20334760.

The previous prime is 20776849. The next prime is 20776897. The reversal of 20776867 is 76867702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20776867 - 2⁷ = 20776739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20776807) by changing a digit.

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, 220984 + ... + 221077.

It is an arithmetic number, because the mean of its divisors is an integer number (5304744).

Almost surely, 2^20776867 is an apocalyptic number.

20776867 is a deficient number, since it is larger than the sum of its proper divisors (442109).

20776867 is an equidigital number, since it uses as much as digits as its factorization.

20776867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442108.

The product of its (nonzero) digits is 197568, while the sum is 43.

The square root of 20776867 is about 4558.1648719633. The cubic root of 20776867 is about 274.9117821718.

The spelling of 20776867 in words is "twenty million, seven hundred seventy-six thousand, eight hundred sixty-seven".