20460689 has 6 divisors (see below), whose sum is σ = 21191430. Its totient is φ = 19754336.

The previous prime is 20460683. The next prime is 20460697. The reversal of 20460689 is 98606402.

It can be written as a sum of positive squares in 3 ways, for example, as 6210064 + 14250625 = 2492^2 + 3775^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20460689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20460683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11324 + ... + 13005.

It is an arithmetic number, because the mean of its divisors is an integer number (3531905).

Almost surely, 2^20460689 is an apocalyptic number.

20460689 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20460689 is a deficient number, since it is larger than the sum of its proper divisors (730741).

20460689 is an equidigital number, since it uses as much as digits as its factorization.

20460689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24387 (or 24358 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 20460689 is about 4523.3493121801. The cubic root of 20460689 is about 273.5101313386.

The spelling of 20460689 in words is "twenty million, four hundred sixty thousand, six hundred eighty-nine".