20660503 has 4 divisors (see below), whose sum is σ = 20951568. Its totient is φ = 20369440.

The previous prime is 20660501. The next prime is 20660527. The reversal of 20660503 is 30506602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20660503 - 2¹ = 20660501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145426 + ... + 145567.

It is an arithmetic number, because the mean of its divisors is an integer number (5237892).

Almost surely, 2^20660503 is an apocalyptic number.

20660503 is a deficient number, since it is larger than the sum of its proper divisors (291065).

20660503 is an equidigital number, since it uses as much as digits as its factorization.

20660503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291064.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 20660503 is about 4545.3826021579. The cubic root of 20660503 is about 274.3975926415.

The spelling of 20660503 in words is "twenty million, six hundred sixty thousand, five hundred three".