20350261 has 2 divisors, whose sum is σ = 20350262. Its totient is φ = 20350260.

The previous prime is 20350249. The next prime is 20350277. The reversal of 20350261 is 16205302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 46225 = 4506^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 20350261 - 2¹⁷ = 20219189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20357261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175130 + 10175131.

It is an arithmetic number, because the mean of its divisors is an integer number (10175131).

Almost surely, 2^20350261 is an apocalyptic number.

20350261 is the 2605-th hex number.

It is an amenable number.

20350261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20350261 is an equidigital number, since it uses as much as digits as its factorization.

20350261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20350261 is about 4511.1263560224. The cubic root of 20350261 is about 273.0171913302.

Adding to 20350261 its reverse (16205302), we get a palindrome (36555563).

The spelling of 20350261 in words is "twenty million, three hundred fifty thousand, two hundred sixty-one".