20707317 has 6 divisors (see below), whose sum is σ = 29910582. Its totient is φ = 13804872.

The previous prime is 20707303. The next prime is 20707327. The reversal of 20707317 is 71370702.

It can be written as a sum of positive squares in only one way, i.e., 16208676 + 4498641 = 4026^2 + 2121^2 .

It is not a de Polignac number, because 20707317 - 2¹⁰ = 20706293 is a prime.

20707317 is a modest number, since divided by 7317 gives 207 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20707327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1150398 + ... + 1150415.

It is an arithmetic number, because the mean of its divisors is an integer number (4985097).

Almost surely, 2^20707317 is an apocalyptic number.

It is an amenable number.

20707317 is a deficient number, since it is larger than the sum of its proper divisors (9203265).

20707317 is a wasteful number, since it uses less digits than its factorization.

20707317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300819 (or 2300816 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 27.

The square root of 20707317 is about 4550.5293098715. The cubic root of 20707317 is about 274.6046860008.

The spelling of 20707317 in words is "twenty million, seven hundred seven thousand, three hundred seventeen".