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20000161 is a prime number
BaseRepresentation
bin100110001001…
…0110110100001
31101122010001201
41030102312201
520110001121
61552401201
7331666336
oct114226641
941563051
1020000161
1110320465
126846201
1341b351c
14292898d
151b50e91
hex1312da1

20000161 has 2 divisors, whose sum is σ = 20000162. Its totient is φ = 20000160.

The previous prime is 20000159. The next prime is 20000171. The reversal of 20000161 is 16100002.

It is an a-pointer prime, because the next prime (20000171) can be obtained adding 20000161 to its sum of digits (10).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 463761 = 4420^2 + 681^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000161 - 21 = 20000159 is a prime.

Together with 20000159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20000171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000080 + 10000081.

It is an arithmetic number, because the mean of its divisors is an integer number (10000081).

Almost surely, 220000161 is an apocalyptic number.

It is an amenable number.

20000161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000161 is an equidigital number, since it uses as much as digits as its factorization.

20000161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20000161 is about 4472.1539553106. The cubic root of 20000161 is about 271.4424900263.

Adding to 20000161 its reverse (16100002), we get a palindrome (36100163).

The spelling of 20000161 in words is "twenty million, one hundred sixty-one", and thus it is an aban number.