20916867 has 8 divisors (see below), whose sum is σ = 29101824. Its totient is φ = 13338248.

The previous prime is 20916829. The next prime is 20916871. The reversal of 20916867 is 76861902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20916867 - 2¹⁵ = 20884099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20916887) 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 7 ways as a sum of consecutive naturals, for example, 151503 + ... + 151640.

It is an arithmetic number, because the mean of its divisors is an integer number (3637728).

Almost surely, 2^20916867 is an apocalyptic number.

20916867 is a deficient number, since it is larger than the sum of its proper divisors (8184957).

20916867 is a wasteful number, since it uses less digits than its factorization.

20916867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303169.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20916867 is about 4573.4961462758. The cubic root of 20916867 is about 275.5278764243.

The spelling of 20916867 in words is "twenty million, nine hundred sixteen thousand, eight hundred sixty-seven".