20011319287 has 2 divisors, whose sum is σ = 20011319288. Its totient is φ = 20011319286.

The previous prime is 20011319267. The next prime is 20011319309. The reversal of 20011319287 is 78291311002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011319287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011319227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005659643 + 10005659644.

It is an arithmetic number, because the mean of its divisors is an integer number (10005659644).

Almost surely, 2^20011319287 is an apocalyptic number.

20011319287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011319287 is an equidigital number, since it uses as much as digits as its factorization.

20011319287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 20011319287 in words is "twenty billion, eleven million, three hundred nineteen thousand, two hundred eighty-seven".