20989683 has 48 divisors (see below), whose sum is σ = 36481536. Its totient is φ = 11459520.

The previous prime is 20989651. The next prime is 20989711. The reversal of 20989683 is 38698902.

It is not a de Polignac number, because 20989683 - 2⁵ = 20989651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20989603) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 60316 + ... + 60662.

It is an arithmetic number, because the mean of its divisors is an integer number (760032).

Almost surely, 2^20989683 is an apocalyptic number.

20989683 is a deficient number, since it is larger than the sum of its proper divisors (15491853).

20989683 is a wasteful number, since it uses less digits than its factorization.

20989683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 20989683 is about 4581.4498796778. The cubic root of 20989683 is about 275.8472295694.

It can be divided in two parts, 2098 and 9683, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 20989683 in words is "twenty million, nine hundred eighty-nine thousand, six hundred eighty-three".