20284569 has 6 divisors (see below), whose sum is σ = 29299946. Its totient is φ = 13523040.

The previous prime is 20284559. The next prime is 20284603. The reversal of 20284569 is 96548202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19474569 + 810000 = 4413^2 + 900^2 .

It is not a de Polignac number, because 20284569 - 2⁷ = 20284441 is a prime.

It is a super-2 number, since 2×20284569² = 822927479031522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20284529) 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 5 ways as a sum of consecutive naturals, for example, 1126912 + ... + 1126929.

Almost surely, 2^20284569 is an apocalyptic number.

It is an amenable number.

20284569 is a deficient number, since it is larger than the sum of its proper divisors (9015377).

20284569 is a wasteful number, since it uses less digits than its factorization.

20284569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253847 (or 2253844 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 20284569 is about 4503.8393621443. The cubic root of 20284569 is about 272.7231020877.

The spelling of 20284569 in words is "twenty million, two hundred eighty-four thousand, five hundred sixty-nine".