20145841 has 4 divisors (see below), whose sum is σ = 20158452. Its totient is φ = 20133232.

The previous prime is 20145821. The next prime is 20145847. The reversal of 20145841 is 14854102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14854102 = 2 ⋅7427051.

It can be written as a sum of positive squares in 2 ways, for example, as 6426225 + 13719616 = 2535^2 + 3704^2 .

It is a cyclic number.

It is not a de Polignac number, because 20145841 - 2⁵ = 20145809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20145847) 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, 3490 + ... + 7243.

It is an arithmetic number, because the mean of its divisors is an integer number (5039613).

Almost surely, 2^20145841 is an apocalyptic number.

It is an amenable number.

20145841 is a deficient number, since it is larger than the sum of its proper divisors (12611).

20145841 is a wasteful number, since it uses less digits than its factorization.

20145841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12610.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 20145841 is about 4488.4118572163. The cubic root of 20145841 is about 272.0999533530.

Adding to 20145841 its reverse (14854102), we get a palindrome (34999943).

The spelling of 20145841 in words is "twenty million, one hundred forty-five thousand, eight hundred forty-one".