20660411 has 4 divisors (see below), whose sum is σ = 20697672. Its totient is φ = 20623152.

The previous prime is 20660399. The next prime is 20660473. The reversal of 20660411 is 11406602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11406602 = 2 ⋅5703301.

It is a cyclic number.

It is not a de Polignac number, because 20660411 - 2⁶ = 20660347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20660611) 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 in 3 ways as a sum of consecutive naturals, for example, 17786 + ... + 18911.

It is an arithmetic number, because the mean of its divisors is an integer number (5174418).

Almost surely, 2^20660411 is an apocalyptic number.

20660411 is a deficient number, since it is larger than the sum of its proper divisors (37261).

20660411 is an equidigital number, since it uses as much as digits as its factorization.

20660411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37260.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20660411 is about 4545.3724819865. The cubic root of 20660411 is about 274.3971853488.

The spelling of 20660411 in words is "twenty million, six hundred sixty thousand, four hundred eleven".