20442041 has 4 divisors (see below), whose sum is σ = 21644532. Its totient is φ = 19239552.

The previous prime is 20442011. The next prime is 20442053. The reversal of 20442041 is 14024402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17305600 + 3136441 = 4160^2 + 1771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20442041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1202473 = 20442041 / (2 + 0 + 4 + 4 + 2 + 0 + 4 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20442011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601220 + ... + 601253.

It is an arithmetic number, because the mean of its divisors is an integer number (5411133).

Almost surely, 2^20442041 is an apocalyptic number.

It is an amenable number.

20442041 is a deficient number, since it is larger than the sum of its proper divisors (1202491).

20442041 is a wasteful number, since it uses less digits than its factorization.

20442041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202490.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 20442041 is about 4521.2875378591. The cubic root of 20442041 is about 273.4270131336.

Adding to 20442041 its reverse (14024402), we get a palindrome (34466443).

The spelling of 20442041 in words is "twenty million, four hundred forty-two thousand, forty-one".