20660587 has 2 divisors, whose sum is σ = 20660588. Its totient is φ = 20660586.

The previous prime is 20660579. The next prime is 20660603. The reversal of 20660587 is 78506602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20660587 - 2³ = 20660579 is a prime.

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, 10330293 + 10330294.

It is an arithmetic number, because the mean of its divisors is an integer number (10330294).

Almost surely, 2^20660587 is an apocalyptic number.

20660587 is a deficient number, since it is larger than the sum of its proper divisors (1).

20660587 is an equidigital number, since it uses as much as digits as its factorization.

20660587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 20660587 is about 4545.3918422948. The cubic root of 20660587 is about 274.3979645164.

The spelling of 20660587 in words is "twenty million, six hundred sixty thousand, five hundred eighty-seven".