20228784 has 20 divisors (see below), whose sum is σ = 52257816. Its totient is φ = 6742912.

The previous prime is 20228783. The next prime is 20228801. The reversal of 20228784 is 48782202.

It is not an unprimeable number, because it can be changed into a prime (20228783) 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 3 ways as a sum of consecutive naturals, for example, 210669 + ... + 210764.

Almost surely, 2^20228784 is an apocalyptic number.

20228784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20228784 is an abundant number, since it is smaller than the sum of its proper divisors (32029032).

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

20228784 is a wasteful number, since it uses less digits than its factorization.

20228784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421444 (or 421438 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 20228784 is about 4497.6420488963. The cubic root of 20228784 is about 272.4728654630.

It can be divided in two parts, 20228 and 784, that added together give a palindrome (21012).

The spelling of 20228784 in words is "twenty million, two hundred twenty-eight thousand, seven hundred eighty-four".