20247624720017 has 4 divisors (see below), whose sum is σ = 20794857820596. Its totient is φ = 19700391619440.

The previous prime is 20247624720007. The next prime is 20247624720019. The reversal of 20247624720017 is 71002742674202.

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 15765021129361 + 4482603590656 = 3970519^2 + 2117216^2 .

It is a cyclic number.

It is not a de Polignac number, because 20247624720017 - 2³⁰ = 20246550978193 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 20247624720017.

It is not an unprimeable number, because it can be changed into a prime (20247624720019) 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, 273616550234 + ... + 273616550307.

It is an arithmetic number, because the mean of its divisors is an integer number (5198714455149).

Almost surely, 2^{20247624720017} is an apocalyptic number.

It is an amenable number.

20247624720017 is a deficient number, since it is larger than the sum of its proper divisors (547233100579).

20247624720017 is an equidigital number, since it uses as much as digits as its factorization.

20247624720017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547233100578.

The product of its (nonzero) digits is 526848, while the sum is 44.

The spelling of 20247624720017 in words is "twenty trillion, two hundred forty-seven billion, six hundred twenty-four million, seven hundred twenty thousand, seventeen".