20284536 has 64 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 6276608.

The previous prime is 20284529. The next prime is 20284541. The reversal of 20284536 is 63548202.

It is a super-2 number, since 2×20284536² = 822924801470592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 33565 + ... + 34163.

It is an arithmetic number, because the mean of its divisors is an integer number (850500).

Almost surely, 2^20284536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20284536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27216000).

20284536 is an abundant number, since it is smaller than the sum of its proper divisors (34147464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20284536 is a wasteful number, since it uses less digits than its factorization.

20284536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 20284536 is about 4503.8356986018. The cubic root of 20284536 is about 272.7229541942.

The spelling of 20284536 in words is "twenty million, two hundred eighty-four thousand, five hundred thirty-six".