20000287 has 2 divisors, whose sum is σ = 20000288. Its totient is φ = 20000286.

The previous prime is 20000269. The next prime is 20000297. The reversal of 20000287 is 78200002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20000287 - 2⁷ = 20000159 is a prime.

It is a super-2 number, since 2×20000287² = 800022960164738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20000297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000143 + 10000144.

It is an arithmetic number, because the mean of its divisors is an integer number (10000144).

Almost surely, 2^20000287 is an apocalyptic number.

20000287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000287 is an equidigital number, since it uses as much as digits as its factorization.

20000287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 20000287 is about 4472.1680424599. The cubic root of 20000287 is about 271.4430600497.

Adding to 20000287 its reverse (78200002), we get a palindrome (98200289).

The spelling of 20000287 in words is "twenty million, two hundred eighty-seven", and thus it is an aban number.