20102287 has 4 divisors (see below), whose sum is σ = 20111256. Its totient is φ = 20093320.

The previous prime is 20102273. The next prime is 20102293. The reversal of 20102287 is 78220102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2148 + ... + 6694.

It is an arithmetic number, because the mean of its divisors is an integer number (5027814).

Almost surely, 2^20102287 is an apocalyptic number.

20102287 is a deficient number, since it is larger than the sum of its proper divisors (8969).

20102287 is an equidigital number, since it uses as much as digits as its factorization.

20102287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8968.

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

The square root of 20102287 is about 4483.5574045617. The cubic root of 20102287 is about 271.9037243971.

Adding to 20102287 its reverse (78220102), we get a palindrome (98322389).

The spelling of 20102287 in words is "twenty million, one hundred two thousand, two hundred eighty-seven".