20002261 has 2 divisors, whose sum is σ = 20002262. Its totient is φ = 20002260.

The previous prime is 20002201. The next prime is 20002313. The reversal of 20002261 is 16220002.

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., 19847025 + 155236 = 4455^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002261 - 2⁷ = 20002133 is a prime.

It is a super-2 number, since 2×20002261² = 800180890224242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20002201) 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, 10001130 + 10001131.

It is an arithmetic number, because the mean of its divisors is an integer number (10001131).

Almost surely, 2^20002261 is an apocalyptic number.

It is an amenable number.

20002261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002261 is an equidigital number, since it uses as much as digits as its factorization.

20002261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20002261 is about 4472.3887353404. The cubic root of 20002261 is about 271.4519901044.

Adding to 20002261 its reverse (16220002), we get a palindrome (36222263).

The spelling of 20002261 in words is "twenty million, two thousand, two hundred sixty-one".