19980866 has 8 divisors (see below), whose sum is σ = 30155664. Its totient is φ = 9928980.

The previous prime is 19980823. The next prime is 19980869. The reversal of 19980866 is 66808991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19980866² = 798470012219912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19980866.

It is not an unprimeable number, because it can be changed into a prime (19980869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30320 + ... + 30971.

It is an arithmetic number, because the mean of its divisors is an integer number (3769458).

Almost surely, 2^19980866 is an apocalyptic number.

19980866 is a deficient number, since it is larger than the sum of its proper divisors (10174798).

19980866 is a wasteful number, since it uses less digits than its factorization.

19980866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61456.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 19980866 is about 4469.9961968664. The cubic root of 19980866 is about 271.3551712621.

The spelling of 19980866 in words is "nineteen million, nine hundred eighty thousand, eight hundred sixty-six".