20012287 has 2 divisors, whose sum is σ = 20012288. Its totient is φ = 20012286.

The previous prime is 20012261. The next prime is 20012303. The reversal of 20012287 is 78221002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20012287 - 2¹¹ = 20010239 is a prime.

It is equal to p_1271335 and since 20012287 and 1271335 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006143 + 10006144.

It is an arithmetic number, because the mean of its divisors is an integer number (10006144).

Almost surely, 2^20012287 is an apocalyptic number.

20012287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012287 is an equidigital number, since it uses as much as digits as its factorization.

20012287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 20012287 is about 4473.5094724388. The cubic root of 20012287 is about 271.4973370289.

Adding to 20012287 its reverse (78221002), we get a palindrome (98233289).

The spelling of 20012287 in words is "twenty million, twelve thousand, two hundred eighty-seven".