20284517 has 8 divisors (see below), whose sum is σ = 22325760. Its totient is φ = 18276160.

The previous prime is 20284501. The next prime is 20284529. The reversal of 20284517 is 71548202.

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

It is a cyclic number.

It is not a de Polignac number, because 20284517 - 2⁴ = 20284501 is a prime.

It is a super-2 number, since 2×20284517² = 822923259846578, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20284517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20286517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6917 + ... + 9402.

It is an arithmetic number, because the mean of its divisors is an integer number (2790720).

Almost surely, 2^20284517 is an apocalyptic number.

It is an amenable number.

20284517 is a deficient number, since it is larger than the sum of its proper divisors (2041243).

20284517 is a wasteful number, since it uses less digits than its factorization.

20284517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16443.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20284517 is about 4503.8335892881. The cubic root of 20284517 is about 272.7228690434.

The spelling of 20284517 in words is "twenty million, two hundred eighty-four thousand, five hundred seventeen".