20914517 has 8 divisors (see below), whose sum is σ = 22569624. Its totient is φ = 19266048.

The previous prime is 20914511. The next prime is 20914529. The reversal of 20914517 is 71541902.

It can be written as a sum of positive squares in 4 ways, for example, as 6482116 + 14432401 = 2546^2 + 3799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20914517 - 2¹⁰ = 20913493 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 20914517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20914511) 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 7 ways as a sum of consecutive naturals, for example, 6353 + ... + 9065.

It is an arithmetic number, because the mean of its divisors is an integer number (2821203).

Almost surely, 2^20914517 is an apocalyptic number.

It is an amenable number.

20914517 is a deficient number, since it is larger than the sum of its proper divisors (1655107).

20914517 is a wasteful number, since it uses less digits than its factorization.

20914517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 20914517 is about 4573.2392240074. The cubic root of 20914517 is about 275.5175575628.

The spelling of 20914517 in words is "twenty million, nine hundred fourteen thousand, five hundred seventeen".