20486689 has 8 divisors (see below), whose sum is σ = 20994048. Its totient is φ = 19982400.

The previous prime is 20486681. The next prime is 20486699. The reversal of 20486689 is 98668402.

It is a happy number.

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 20486689 - 2³ = 20486681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20486681) 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, 18304 + ... + 19390.

It is an arithmetic number, because the mean of its divisors is an integer number (2624256).

Almost surely, 2^20486689 is an apocalyptic number.

It is an amenable number.

20486689 is a deficient number, since it is larger than the sum of its proper divisors (507359).

20486689 is a wasteful number, since it uses less digits than its factorization.

20486689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 20486689 is about 4526.2223763311. Note that the first 3 decimals coincide. The cubic root of 20486689 is about 273.6259347601.

The spelling of 20486689 in words is "twenty million, four hundred eighty-six thousand, six hundred eighty-nine".