20841265349 has 2 divisors, whose sum is σ = 20841265350. Its totient is φ = 20841265348.

The previous prime is 20841265343. The next prime is 20841265381. The reversal of 20841265349 is 94356214802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19061944225 + 1779321124 = 138065^2 + 42182^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20841265349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20841265343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420632674 + 10420632675.

It is an arithmetic number, because the mean of its divisors is an integer number (10420632675).

Almost surely, 2^20841265349 is an apocalyptic number.

It is an amenable number.

20841265349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20841265349 is an equidigital number, since it uses as much as digits as its factorization.

20841265349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 20841265349 in words is "twenty billion, eight hundred forty-one million, two hundred sixty-five thousand, three hundred forty-nine".