20442017 has 4 divisors (see below), whose sum is σ = 20459076. Its totient is φ = 20424960.

The previous prime is 20442011. The next prime is 20442053. The reversal of 20442017 is 71024402.

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 18011536 + 2430481 = 4244^2 + 1559^2 .

It is a cyclic number.

It is not a de Polignac number, because 20442017 - 2⁸ = 20441761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20442017.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6584 + ... + 9177.

It is an arithmetic number, because the mean of its divisors is an integer number (5114769).

Almost surely, 2^20442017 is an apocalyptic number.

It is an amenable number.

20442017 is a deficient number, since it is larger than the sum of its proper divisors (17059).

20442017 is a wasteful number, since it uses less digits than its factorization.

20442017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17058.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 20442017 is about 4521.2848837471. The cubic root of 20442017 is about 273.4269061278.

Adding to 20442017 its reverse (71024402), we get a palindrome (91466419).

The spelling of 20442017 in words is "twenty million, four hundred forty-two thousand, seventeen".