20605141 has 4 divisors (see below), whose sum is σ = 20614252. Its totient is φ = 20596032.

The previous prime is 20605099. The next prime is 20605147. The reversal of 20605141 is 14150602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14150602 = 2 ⋅7075301.

It can be written as a sum of positive squares in 2 ways, for example, as 13476241 + 7128900 = 3671^2 + 2670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20605141 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 (20605147) 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, 1711 + ... + 6643.

It is an arithmetic number, because the mean of its divisors is an integer number (5153563).

Almost surely, 2^20605141 is an apocalyptic number.

It is an amenable number.

20605141 is a deficient number, since it is larger than the sum of its proper divisors (9111).

20605141 is an equidigital number, since it uses as much as digits as its factorization.

20605141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9110.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20605141 is about 4539.2886006510. The cubic root of 20605141 is about 274.1522809540.

Adding to 20605141 its reverse (14150602), we get a palindrome (34755743).

The spelling of 20605141 in words is "twenty million, six hundred five thousand, one hundred forty-one".