20489651 has 8 divisors (see below), whose sum is σ = 25218144. Its totient is φ = 16211520.

The previous prime is 20489647. The next prime is 20489653. The reversal of 20489651 is 15698402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20489651 - 2² = 20489647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20489653) 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 7 ways as a sum of consecutive naturals, for example, 112490 + ... + 112671.

It is an arithmetic number, because the mean of its divisors is an integer number (3152268).

Almost surely, 2^20489651 is an apocalyptic number.

20489651 is a deficient number, since it is larger than the sum of its proper divisors (4728493).

20489651 is a wasteful number, since it uses less digits than its factorization.

20489651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225181.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20489651 is about 4526.5495689322. The cubic root of 20489651 is about 273.6391212241.

The spelling of 20489651 in words is "twenty million, four hundred eighty-nine thousand, six hundred fifty-one".