20551208 has 8 divisors (see below), whose sum is σ = 38533530. Its totient is φ = 10275600.

The previous prime is 20551207. The next prime is 20551229. The reversal of 20551208 is 80215502.

It can be written as a sum of positive squares in only one way, i.e., 11682724 + 8868484 = 3418^2 + 2978^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20551207) by changing a digit.

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 as a sum of consecutive naturals, namely, 1284443 + ... + 1284458.

Almost surely, 2^20551208 is an apocalyptic number.

It is an amenable number.

20551208 is a deficient number, since it is larger than the sum of its proper divisors (17982322).

20551208 is a wasteful number, since it uses less digits than its factorization.

20551208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568907 (or 2568903 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20551208 is about 4533.3440195952. The cubic root of 20551208 is about 273.9128783345.

The spelling of 20551208 in words is "twenty million, five hundred fifty-one thousand, two hundred eight".