20281688866 has 16 divisors (see below), whose sum is σ = 30487129920. Its totient is φ = 10119331600.

The previous prime is 20281688863. The next prime is 20281688879. The reversal of 20281688866 is 66888618202.

It is a super-2 number, since 2×20281688866² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20281688863) 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 7 ways as a sum of consecutive naturals, for example, 3023316 + ... + 3030016.

It is an arithmetic number, because the mean of its divisors is an integer number (1905445620).

Almost surely, 2^20281688866 is an apocalyptic number.

20281688866 is a deficient number, since it is larger than the sum of its proper divisors (10205441054).

20281688866 is a wasteful number, since it uses less digits than its factorization.

20281688866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9689.

The product of its (nonzero) digits is 3538944, while the sum is 55.

The spelling of 20281688866 in words is "twenty billion, two hundred eighty-one million, six hundred eighty-eight thousand, eight hundred sixty-six".