20825198866 has 16 divisors (see below), whose sum is σ = 33223647744. Its totient is φ = 9756143424.

The previous prime is 20825198851. The next prime is 20825198873. The reversal of 20825198866 is 66889152802.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1365750 + ... + 1380913.

It is an arithmetic number, because the mean of its divisors is an integer number (2076477984).

Almost surely, 2^20825198866 is an apocalyptic number.

20825198866 is a deficient number, since it is larger than the sum of its proper divisors (12398448878).

20825198866 is a wasteful number, since it uses less digits than its factorization.

20825198866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2746905.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 20825198866 in words is "twenty billion, eight hundred twenty-five million, one hundred ninety-eight thousand, eight hundred sixty-six".