20284428 has 24 divisors (see below), whose sum is σ = 47416320. Its totient is φ = 6749200.

The previous prime is 20284421. The next prime is 20284441. The reversal of 20284428 is 82448202.

It is a super-2 number, since 2×20284428² = 822916038574368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20284395 and 20284404.

It is not an unprimeable number, because it can be changed into a prime (20284421) 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, 7453 + ... + 9803.

It is an arithmetic number, because the mean of its divisors is an integer number (1975680).

Almost surely, 2^20284428 is an apocalyptic number.

It is an amenable number.

20284428 is an abundant number, since it is smaller than the sum of its proper divisors (27131892).

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

20284428 is a wasteful number, since it uses less digits than its factorization.

20284428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077 (or 3075 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 20284428 is about 4503.8237088057. The cubic root of 20284428 is about 272.7224701781.

The spelling of 20284428 in words is "twenty million, two hundred eighty-four thousand, four hundred twenty-eight".