20228380 has 24 divisors (see below), whose sum is σ = 42921648. Its totient is φ = 8007168.

The previous prime is 20228363. The next prime is 20228423. The reversal of 20228380 is 8382202.

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 7 ways as a sum of consecutive naturals, for example, 3274 + ... + 7153.

It is an arithmetic number, because the mean of its divisors is an integer number (1788402).

Almost surely, 2^20228380 is an apocalyptic number.

20228380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20228380 is an abundant number, since it is smaller than the sum of its proper divisors (22693268).

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

20228380 is a wasteful number, since it uses less digits than its factorization.

20228380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10533 (or 10531 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20228380 is about 4497.5971362495. The cubic root of 20228380 is about 272.4710515499.

It can be divided in two parts, 202 and 28380, that added together give a palindrome (28582).

The spelling of 20228380 in words is "twenty million, two hundred twenty-eight thousand, three hundred eighty".