20543317 has 2 divisors, whose sum is σ = 20543318. Its totient is φ = 20543316.

The previous prime is 20543311. The next prime is 20543321. The reversal of 20543317 is 71334502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19722481 + 820836 = 4441^2 + 906^2 .

It is a cyclic number.

It is not a de Polignac number, because 20543317 - 2³ = 20543309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20543291 and 20543300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20543311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271658 + 10271659.

It is an arithmetic number, because the mean of its divisors is an integer number (10271659).

Almost surely, 2^20543317 is an apocalyptic number.

It is an amenable number.

20543317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20543317 is an equidigital number, since it uses as much as digits as its factorization.

20543317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20543317 is about 4532.4736072039. The cubic root of 20543317 is about 273.8778159475.

Adding to 20543317 its reverse (71334502), we get a palindrome (91877819).

The spelling of 20543317 in words is "twenty million, five hundred forty-three thousand, three hundred seventeen".