20936317 has 2 divisors, whose sum is σ = 20936318. Its totient is φ = 20936316.

The previous prime is 20936303. The next prime is 20936329. The reversal of 20936317 is 71363902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13461561 + 7474756 = 3669^2 + 2734^2 .

It is a cyclic number.

It is not a de Polignac number, because 20936317 - 2¹⁵ = 20903549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20936387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10468158 + 10468159.

It is an arithmetic number, because the mean of its divisors is an integer number (10468159).

Almost surely, 2^20936317 is an apocalyptic number.

It is an amenable number.

20936317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20936317 is an equidigital number, since it uses as much as digits as its factorization.

20936317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 20936317 is about 4575.6220342157. The cubic root of 20936317 is about 275.6132518135.

The spelling of 20936317 in words is "twenty million, nine hundred thirty-six thousand, three hundred seventeen".