20380266 has 48 divisors (see below), whose sum is σ = 46096128. Its totient is φ = 6501600.

The previous prime is 20380259. The next prime is 20380267. The reversal of 20380266 is 66208302.

20380266 is a `hidden beast` number, since 20 + 380 + 266 = 666.

It is not an unprimeable number, because it can be changed into a prime (20380267) 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, 47071 + ... + 47501.

It is an arithmetic number, because the mean of its divisors is an integer number (960336).

Almost surely, 2^20380266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20380266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23048064).

20380266 is an abundant number, since it is smaller than the sum of its proper divisors (25715862).

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

20380266 is a wasteful number, since it uses less digits than its factorization.

20380266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20380266 is about 4514.4507971624. The cubic root of 20380266 is about 273.1513068584.

Adding to 20380266 its reverse (66208302), we get a palindrome (86588568).

The spelling of 20380266 in words is "twenty million, three hundred eighty thousand, two hundred sixty-six".