20284656 has 80 divisors (see below), whose sum is σ = 60781824. Its totient is φ = 5709312.

The previous prime is 20284651. The next prime is 20284669. The reversal of 20284656 is 65648202.

It is a super-2 number, since 2×20284656² = 822934538076672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20284651) 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 15 ways as a sum of consecutive naturals, for example, 24115 + ... + 24941.

Almost surely, 2^20284656 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 20284656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30390912).

20284656 is an abundant number, since it is smaller than the sum of its proper divisors (40497168).

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

20284656 is a wasteful number, since it uses less digits than its factorization.

20284656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 20284656 is about 4503.8490205601. The cubic root of 20284656 is about 272.7234919880.

The spelling of 20284656 in words is "twenty million, two hundred eighty-four thousand, six hundred fifty-six".