20181235208 has 8 divisors (see below), whose sum is σ = 37839816030. Its totient is φ = 10090617600.

The previous prime is 20181235183. The next prime is 20181235213. The reversal of 20181235208 is 80253218102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17076739684 + 3104495524 = 130678^2 + 55718^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1261327193 + ... + 1261327208.

Almost surely, 2^20181235208 is an apocalyptic number.

It is an amenable number.

20181235208 is a deficient number, since it is larger than the sum of its proper divisors (17658580822).

20181235208 is a wasteful number, since it uses less digits than its factorization.

20181235208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522654407 (or 2522654403 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The spelling of 20181235208 in words is "twenty billion, one hundred eighty-one million, two hundred thirty-five thousand, two hundred eight".