20645001241 has 2 divisors, whose sum is σ = 20645001242. Its totient is φ = 20645001240.

The previous prime is 20645001233. The next prime is 20645001281. The reversal of 20645001241 is 14210054602.

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., 20643942400 + 1058841 = 143680^2 + 1029^2 .

It is a cyclic number.

It is not a de Polignac number, because 20645001241 - 2³ = 20645001233 is a prime.

It is not a weakly prime, because it can be changed into another prime (20645001281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322500620 + 10322500621.

It is an arithmetic number, because the mean of its divisors is an integer number (10322500621).

Almost surely, 2^20645001241 is an apocalyptic number.

It is an amenable number.

20645001241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645001241 is an equidigital number, since it uses as much as digits as its factorization.

20645001241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 20645001241 its reverse (14210054602), we get a palindrome (34855055843).

The spelling of 20645001241 in words is "twenty billion, six hundred forty-five million, one thousand, two hundred forty-one".