20289208 has 16 divisors (see below), whose sum is σ = 38611080. Its totient is φ = 9992928.

The previous prime is 20289193. The next prime is 20289277. The reversal of 20289208 is 80298202.

It is a super-2 number, since 2×20289208² = 823303922534528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20289208.

It is a congruent number.

It is an unprimeable number.

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, 18391 + ... + 19462.

Almost surely, 2^20289208 is an apocalyptic number.

It is an amenable number.

20289208 is a deficient number, since it is larger than the sum of its proper divisors (18321872).

20289208 is a wasteful number, since it uses less digits than its factorization.

20289208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37926 (or 37922 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 20289208 is about 4504.3543377492. The cubic root of 20289208 is about 272.7438907315.

It can be divided in two parts, 2028 and 9208, that added together give a square (11236 = 106²).

The spelling of 20289208 in words is "twenty million, two hundred eighty-nine thousand, two hundred eight".