20989630 has 16 divisors (see below), whose sum is σ = 38037600. Its totient is φ = 8338912.

The previous prime is 20989627. The next prime is 20989651. The reversal of 20989630 is 3698902.

It is a self number, because there is not a number n which added to its sum of digits gives 20989630.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5554 + ... + 8533.

It is an arithmetic number, because the mean of its divisors is an integer number (2377350).

Almost surely, 2^20989630 is an apocalyptic number.

20989630 is a deficient number, since it is larger than the sum of its proper divisors (17047970).

20989630 is a wasteful number, since it uses less digits than its factorization.

20989630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14243.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20989630 is about 4581.4440954791. Note that the first 3 decimals coincide. The cubic root of 20989630 is about 275.8469973932.

The spelling of 20989630 in words is "twenty million, nine hundred eighty-nine thousand, six hundred thirty".