20228778 has 48 divisors (see below), whose sum is σ = 45995040. Its totient is φ = 6662736.

The previous prime is 20228777. The next prime is 20228779. The reversal of 20228778 is 87782202.

It is an interprime number because it is at equal distance from previous prime (20228777) and next prime (20228779).

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (20228777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51808 + ... + 52196.

It is an arithmetic number, because the mean of its divisors is an integer number (958230).

Almost surely, 2^20228778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20228778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22997520).

20228778 is an abundant number, since it is smaller than the sum of its proper divisors (25766262).

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

20228778 is a wasteful number, since it uses less digits than its factorization.

20228778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 20228778 is about 4497.6413818801. The cubic root of 20228778 is about 272.4728385239.

The spelling of 20228778 in words is "twenty million, two hundred twenty-eight thousand, seven hundred seventy-eight".