20284287 has 8 divisors (see below), whose sum is σ = 27371904. Its totient is φ = 13359768.

The previous prime is 20284279. The next prime is 20284289. The reversal of 20284287 is 78248202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20284287 - 2³ = 20284279 is a prime.

It is a super-2 number, since 2×20284287² = 822904598196738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20284289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40483 + ... + 40980.

It is an arithmetic number, because the mean of its divisors is an integer number (3421488).

Almost surely, 2^20284287 is an apocalyptic number.

20284287 is a deficient number, since it is larger than the sum of its proper divisors (7087617).

20284287 is an equidigital number, since it uses as much as digits as its factorization.

20284287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81549.

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 20284287 is about 4503.8080554127. The cubic root of 20284287 is about 272.7218382654.

The spelling of 20284287 in words is "twenty million, two hundred eighty-four thousand, two hundred eighty-seven".