20115287 has 2 divisors, whose sum is σ = 20115288. Its totient is φ = 20115286.

The previous prime is 20115259. The next prime is 20115307. The reversal of 20115287 is 78251102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20115287 - 2⁸ = 20115031 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20115247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10057643 + 10057644.

It is an arithmetic number, because the mean of its divisors is an integer number (10057644).

Almost surely, 2^20115287 is an apocalyptic number.

20115287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20115287 is an equidigital number, since it uses as much as digits as its factorization.

20115287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 20115287 is about 4485.0069119233. The cubic root of 20115287 is about 271.9623244746.

Adding to 20115287 its reverse (78251102), we get a palindrome (98366389).

It can be divided in two parts, 20115 and 287, that added together give a palindrome (20402).

The spelling of 20115287 in words is "twenty million, one hundred fifteen thousand, two hundred eighty-seven".