20443646287 has 2 divisors, whose sum is σ = 20443646288. Its totient is φ = 20443646286.

The previous prime is 20443646281. The next prime is 20443646357. The reversal of 20443646287 is 78264634402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20443646287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20443646281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221823143 + 10221823144.

It is an arithmetic number, because the mean of its divisors is an integer number (10221823144).

Almost surely, 2^20443646287 is an apocalyptic number.

20443646287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443646287 is an equidigital number, since it uses as much as digits as its factorization.

20443646287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1548288, while the sum is 46.

The spelling of 20443646287 in words is "twenty billion, four hundred forty-three million, six hundred forty-six thousand, two hundred eighty-seven".