20908489 has 16 divisors (see below), whose sum is σ = 24534400. Its totient is φ = 17449344.

The previous prime is 20908471. The next prime is 20908501. The reversal of 20908489 is 98480902.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20908489 - 2⁵ = 20908457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20908409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50917 + ... + 51325.

It is an arithmetic number, because the mean of its divisors is an integer number (1533400).

Almost surely, 2^20908489 is an apocalyptic number.

It is an amenable number.

20908489 is a deficient number, since it is larger than the sum of its proper divisors (3625911).

20908489 is a wasteful number, since it uses less digits than its factorization.

20908489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 20908489 is about 4572.5801250498. The cubic root of 20908489 is about 275.4910850505.

The spelling of 20908489 in words is "twenty million, nine hundred eight thousand, four hundred eighty-nine".