20115215441 has 2 divisors, whose sum is σ = 20115215442. Its totient is φ = 20115215440.

The previous prime is 20115215437. The next prime is 20115215459. The reversal of 20115215441 is 14451251102.

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., 17077001041 + 3038214400 = 130679^2 + 55120^2 .

It is a cyclic number.

It is not a de Polignac number, because 20115215441 - 2² = 20115215437 is a prime.

It is a super-3 number, since 3×20115215441³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20115215441.

It is not a weakly prime, because it can be changed into another prime (20115215411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10057607720 + 10057607721.

It is an arithmetic number, because the mean of its divisors is an integer number (10057607721).

Almost surely, 2^20115215441 is an apocalyptic number.

It is an amenable number.

20115215441 is a deficient number, since it is larger than the sum of its proper divisors (1).

20115215441 is an equidigital number, since it uses as much as digits as its factorization.

20115215441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 26.

Adding to 20115215441 its reverse (14451251102), we get a palindrome (34566466543).

The spelling of 20115215441 in words is "twenty billion, one hundred fifteen million, two hundred fifteen thousand, four hundred forty-one".