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20718073 is a prime number
BaseRepresentation
bin100111100001…
…0000111111001
31102222120212001
41033002013321
520300434243
62020021001
7341046355
oct117020771
942876761
1020718073
1110770882
126b31761
1343a521c
142a74465
151c43a4d
hex13c21f9

20718073 has 2 divisors, whose sum is σ = 20718074. Its totient is φ = 20718072.

The previous prime is 20718031. The next prime is 20718077. The reversal of 20718073 is 37081702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16104169 + 4613904 = 4013^2 + 2148^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20718073 is a prime.

It is not a weakly prime, because it can be changed into another prime (20718077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10359036 + 10359037.

It is an arithmetic number, because the mean of its divisors is an integer number (10359037).

Almost surely, 220718073 is an apocalyptic number.

It is an amenable number.

20718073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20718073 is an equidigital number, since it uses as much as digits as its factorization.

20718073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20718073 is about 4551.7109969769. The cubic root of 20718073 is about 274.6522237342.

Adding to 20718073 its reverse (37081702), we get a palindrome (57799775).

The spelling of 20718073 in words is "twenty million, seven hundred eighteen thousand, seventy-three".