20689459 has 8 divisors (see below), whose sum is σ = 25036128. Its totient is φ = 16690560.

The previous prime is 20689457. The next prime is 20689469. The reversal of 20689459 is 95498602.

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

It is a cyclic number.

It is not a de Polignac number, because 20689459 - 2¹ = 20689457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20689453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86812 + ... + 87049.

It is an arithmetic number, because the mean of its divisors is an integer number (3129516).

Almost surely, 2^20689459 is an apocalyptic number.

20689459 is a deficient number, since it is larger than the sum of its proper divisors (4346669).

20689459 is a wasteful number, since it uses less digits than its factorization.

20689459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173885.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 20689459 is about 4548.5666973235. The cubic root of 20689459 is about 274.5257235602.

The spelling of 20689459 in words is "twenty million, six hundred eighty-nine thousand, four hundred fifty-nine".