20989113 has 16 divisors (see below), whose sum is σ = 28817856. Its totient is φ = 13582400.

The previous prime is 20989103. The next prime is 20989147. The reversal of 20989113 is 31198902.

It is a cyclic number.

It is not a de Polignac number, because 20989113 - 2⁶ = 20989049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20989103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15406 + ... + 16712.

It is an arithmetic number, because the mean of its divisors is an integer number (1801116).

Almost surely, 2^20989113 is an apocalyptic number.

It is an amenable number.

20989113 is a deficient number, since it is larger than the sum of its proper divisors (7828743).

20989113 is a wasteful number, since it uses less digits than its factorization.

20989113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 20989113 is about 4581.3876718741. The cubic root of 20989113 is about 275.8447325594.

It can be divided in two parts, 2098 and 9113, that added together give a palindrome (11211).

The spelling of 20989113 in words is "twenty million, nine hundred eighty-nine thousand, one hundred thirteen".