20801317 has 2 divisors, whose sum is σ = 20801318. Its totient is φ = 20801316.

The previous prime is 20801243. The next prime is 20801383. The reversal of 20801317 is 71310802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13905441 + 6895876 = 3729^2 + 2626^2 .

It is a cyclic number.

It is not a de Polignac number, because 20801317 - 2¹¹ = 20799269 is a prime.

It is equal to p_1318207 and since 20801317 and 1318207 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20801017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10400658 + 10400659.

It is an arithmetic number, because the mean of its divisors is an integer number (10400659).

Almost surely, 2^20801317 is an apocalyptic number.

It is an amenable number.

20801317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20801317 is an equidigital number, since it uses as much as digits as its factorization.

20801317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 20801317 is about 4560.8460837875. The cubic root of 20801317 is about 275.0195776696.

The spelling of 20801317 in words is "twenty million, eight hundred one thousand, three hundred seventeen".