20718353 has 2 divisors, whose sum is σ = 20718354. Its totient is φ = 20718352.

The previous prime is 20718337. The next prime is 20718403. The reversal of 20718353 is 35381702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16589329 + 4129024 = 4073^2 + 2032^2 .

It is a cyclic number.

It is not a de Polignac number, because 20718353 - 2⁴ = 20718337 is a prime.

It is not a weakly prime, because it can be changed into another prime (20718953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10359176 + 10359177.

It is an arithmetic number, because the mean of its divisors is an integer number (10359177).

Almost surely, 2^20718353 is an apocalyptic number.

It is an amenable number.

20718353 is a deficient number, since it is larger than the sum of its proper divisors (1).

20718353 is an equidigital number, since it uses as much as digits as its factorization.

20718353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20718353 is about 4551.7417545375. The cubic root of 20718353 is about 274.6534610158.

The spelling of 20718353 in words is "twenty million, seven hundred eighteen thousand, three hundred fifty-three".