20766667 has 8 divisors (see below), whose sum is σ = 21056112. Its totient is φ = 20479200.

The previous prime is 20766661. The next prime is 20766671. The reversal of 20766667 is 76666702.

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 20766667 - 2¹¹ = 20764619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20766661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44817 + ... + 45277.

It is an arithmetic number, because the mean of its divisors is an integer number (2632014).

Almost surely, 2^20766667 is an apocalyptic number.

20766667 is a deficient number, since it is larger than the sum of its proper divisors (289445).

20766667 is a wasteful number, since it uses less digits than its factorization.

20766667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 20766667 is about 4557.0458632759. The cubic root of 20766667 is about 274.8667872715.

The spelling of 20766667 in words is "twenty million, seven hundred sixty-six thousand, six hundred sixty-seven".