20611667 has 8 divisors (see below), whose sum is σ = 21926016. Its totient is φ = 19308672.

The previous prime is 20611649. The next prime is 20611681. The reversal of 20611667 is 76611602.

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 20611667 - 2²⁰ = 19563091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20611687) 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, 1073 + ... + 6509.

It is an arithmetic number, because the mean of its divisors is an integer number (2740752).

Almost surely, 2^20611667 is an apocalyptic number.

20611667 is a deficient number, since it is larger than the sum of its proper divisors (1314349).

20611667 is a wasteful number, since it uses less digits than its factorization.

20611667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5677.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20611667 is about 4540.0073788486. The cubic root of 20611667 is about 274.1812208019.

The spelling of 20611667 in words is "twenty million, six hundred eleven thousand, six hundred sixty-seven".