20489249 has 4 divisors (see below), whose sum is σ = 22351920. Its totient is φ = 18626580.

The previous prime is 20489237. The next prime is 20489257. The reversal of 20489249 is 94298402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20489249 - 2¹⁶ = 20423713 is a prime.

It is a super-3 number, since 3×20489249³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20489269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 931319 + ... + 931340.

It is an arithmetic number, because the mean of its divisors is an integer number (5587980).

Almost surely, 2^20489249 is an apocalyptic number.

It is an amenable number.

20489249 is a deficient number, since it is larger than the sum of its proper divisors (1862671).

20489249 is a wasteful number, since it uses less digits than its factorization.

20489249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862670.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 20489249 is about 4526.5051640311. The cubic root of 20489249 is about 273.6373316435.

The spelling of 20489249 in words is "twenty million, four hundred eighty-nine thousand, two hundred forty-nine".