20456641291 has 2 divisors, whose sum is σ = 20456641292. Its totient is φ = 20456641290.

The previous prime is 20456641253. The next prime is 20456641307. The reversal of 20456641291 is 19214665402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20456641291 - 2⁹ = 20456640779 is a prime.

It is a super-2 number, since 2×20456641291² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20456641391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228320645 + 10228320646.

It is an arithmetic number, because the mean of its divisors is an integer number (10228320646).

Almost surely, 2^20456641291 is an apocalyptic number.

20456641291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20456641291 is an equidigital number, since it uses as much as digits as its factorization.

20456641291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 20456641291 in words is "twenty billion, four hundred fifty-six million, six hundred forty-one thousand, two hundred ninety-one".