20660567 has 2 divisors, whose sum is σ = 20660568. Its totient is φ = 20660566.

The previous prime is 20660527. The next prime is 20660579. The reversal of 20660567 is 76506602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20660567 is a prime.

It is a super-2 number, since 2×20660567² = 853718057522978, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20660527) 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 as a sum of consecutive naturals, namely, 10330283 + 10330284.

It is an arithmetic number, because the mean of its divisors is an integer number (10330284).

Almost surely, 2^20660567 is an apocalyptic number.

20660567 is a deficient number, since it is larger than the sum of its proper divisors (1).

20660567 is an equidigital number, since it uses as much as digits as its factorization.

20660567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20660567 is about 4545.3896422639. The cubic root of 20660567 is about 274.3978759749.

The spelling of 20660567 in words is "twenty million, six hundred sixty thousand, five hundred sixty-seven".