20789986 has 8 divisors (see below), whose sum is σ = 35640000. Its totient is φ = 8909988.

The previous prime is 20789927. The next prime is 20790017. The reversal of 20789986 is 68998702.

It is a happy number.

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

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, 742486 + ... + 742513.

It is an arithmetic number, because the mean of its divisors is an integer number (4455000).

Almost surely, 2^20789986 is an apocalyptic number.

20789986 is a deficient number, since it is larger than the sum of its proper divisors (14850014).

20789986 is a wasteful number, since it uses less digits than its factorization.

20789986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485008.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 20789986 is about 4559.6037108503. The cubic root of 20789986 is about 274.9696319083.

The spelling of 20789986 in words is "twenty million, seven hundred eighty-nine thousand, nine hundred eighty-six".