20380208 has 20 divisors (see below), whose sum is σ = 41204208. Its totient is φ = 9746880.

The previous prime is 20380207. The next prime is 20380211. The reversal of 20380208 is 80208302.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (20380207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27323 + ... + 28058.

Almost surely, 2^20380208 is an apocalyptic number.

It is an amenable number.

20380208 is an abundant number, since it is smaller than the sum of its proper divisors (20824000).

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

20380208 is a wasteful number, since it uses less digits than its factorization.

20380208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55412 (or 55406 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20380208 is about 4514.4443733421. Note that the first 3 decimals coincide. The cubic root of 20380208 is about 273.1510477386.

The spelling of 20380208 in words is "twenty million, three hundred eighty thousand, two hundred eight".