20019841 has 4 divisors (see below), whose sum is σ = 20032432. Its totient is φ = 20007252.

The previous prime is 20019833. The next prime is 20019851. The reversal of 20019841 is 14891002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20019841 - 2³ = 20019833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20019851) 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 3 ways as a sum of consecutive naturals, for example, 3495 + ... + 7228.

It is an arithmetic number, because the mean of its divisors is an integer number (5008108).

Almost surely, 2^20019841 is an apocalyptic number.

It is an amenable number.

20019841 is a deficient number, since it is larger than the sum of its proper divisors (12591).

20019841 is a wasteful number, since it uses less digits than its factorization.

20019841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12590.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20019841 is about 4474.3536963454. The cubic root of 20019841 is about 271.5314932598.

The spelling of 20019841 in words is "twenty million, nineteen thousand, eight hundred forty-one".