20275287 has 4 divisors (see below), whose sum is σ = 27033720. Its totient is φ = 13516856.

The previous prime is 20275267. The next prime is 20275289. The reversal of 20275287 is 78257202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20275287 - 2⁷ = 20275159 is a prime.

It is a super-2 number, since 2×20275287² = 822174525864738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20275289) 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, 3379212 + ... + 3379217.

It is an arithmetic number, because the mean of its divisors is an integer number (6758430).

Almost surely, 2^20275287 is an apocalyptic number.

20275287 is a deficient number, since it is larger than the sum of its proper divisors (6758433).

20275287 is an equidigital number, since it uses as much as digits as its factorization.

20275287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6758432.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20275287 is about 4502.8087900776. The cubic root of 20275287 is about 272.6814973578.

The spelling of 20275287 in words is "twenty million, two hundred seventy-five thousand, two hundred eighty-seven".