20660547 has 8 divisors (see below), whose sum is σ = 27608256. Its totient is φ = 13743272.

The previous prime is 20660527. The next prime is 20660567. The reversal of 20660547 is 74506602.

It is an interprime number because it is at equal distance from previous prime (20660527) and next prime (20660567).

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 20660547 - 2⁶ = 20660483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20660527) 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, 5973 + ... + 8774.

It is an arithmetic number, because the mean of its divisors is an integer number (3451032).

Almost surely, 2^20660547 is an apocalyptic number.

20660547 is a deficient number, since it is larger than the sum of its proper divisors (6947709).

20660547 is a wasteful number, since it uses less digits than its factorization.

20660547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15217.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 20660547 is about 4545.3874422320. The cubic root of 20660547 is about 274.3977874332.

The spelling of 20660547 in words is "twenty million, six hundred sixty thousand, five hundred forty-seven".