20650081 has 2 divisors, whose sum is σ = 20650082. Its totient is φ = 20650080.

The previous prime is 20650057. The next prime is 20650099. The reversal of 20650081 is 18005602.

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., 15880225 + 4769856 = 3985^2 + 2184^2 .

It is a cyclic number.

It is not a de Polignac number, because 20650081 - 2⁷ = 20649953 is a prime.

It is a super-2 number, since 2×20650081² = 852851690613122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20650381) 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, 10325040 + 10325041.

It is an arithmetic number, because the mean of its divisors is an integer number (10325041).

Almost surely, 2^20650081 is an apocalyptic number.

It is an amenable number.

20650081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20650081 is an equidigital number, since it uses as much as digits as its factorization.

20650081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 20650081 is about 4544.2360193986. The cubic root of 20650081 is about 274.3514457704.

Adding to 20650081 its reverse (18005602), we get a palindrome (38655683).

The spelling of 20650081 in words is "twenty million, six hundred fifty thousand, eighty-one".