20317229 has 2 divisors, whose sum is σ = 20317230. Its totient is φ = 20317228.

The previous prime is 20317223. The next prime is 20317247. The reversal of 20317229 is 92271302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11377129 + 8940100 = 3373^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 20317229 - 2⁸ = 20316973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20317198 and 20317207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20317223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10158614 + 10158615.

It is an arithmetic number, because the mean of its divisors is an integer number (10158615).

Almost surely, 2^20317229 is an apocalyptic number.

It is an amenable number.

20317229 is a deficient number, since it is larger than the sum of its proper divisors (1).

20317229 is an equidigital number, since it uses as much as digits as its factorization.

20317229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20317229 is about 4507.4636992437. The cubic root of 20317229 is about 272.8693932636.

The spelling of 20317229 in words is "twenty million, three hundred seventeen thousand, two hundred twenty-nine".