20209061 has 2 divisors, whose sum is σ = 20209062. Its totient is φ = 20209060.

The previous prime is 20209043. The next prime is 20209081. The reversal of 20209061 is 16090202.

It is an a-pointer prime, because the next prime (20209081) can be obtained adding 20209061 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16248961 + 3960100 = 4031^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 20209061 - 2¹⁴ = 20192677 is a prime.

It is a super-2 number, since 2×20209061² = 816812293003442, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20209081) 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, 10104530 + 10104531.

It is an arithmetic number, because the mean of its divisors is an integer number (10104531).

Almost surely, 2^20209061 is an apocalyptic number.

It is an amenable number.

20209061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20209061 is an equidigital number, since it uses as much as digits as its factorization.

20209061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20209061 is about 4495.4489208532. The cubic root of 20209061 is about 272.3842832755.

Adding to 20209061 its reverse (16090202), we get a palindrome (36299263).

The spelling of 20209061 in words is "twenty million, two hundred nine thousand, sixty-one".