20281188 has 12 divisors (see below), whose sum is σ = 47322800. Its totient is φ = 6760392.

The previous prime is 20281169. The next prime is 20281199. The reversal of 20281188 is 88118202.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20281188² = 822653173382688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 845038 + ... + 845061.

Almost surely, 2^20281188 is an apocalyptic number.

It is an amenable number.

20281188 is an abundant number, since it is smaller than the sum of its proper divisors (27041612).

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

20281188 is a wasteful number, since it uses less digits than its factorization.

20281188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690106 (or 1690104 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 20281188 is about 4503.4640000782. The cubic root of 20281188 is about 272.7079488935.

The spelling of 20281188 in words is "twenty million, two hundred eighty-one thousand, one hundred eighty-eight".