20690336 has 12 divisors (see below), whose sum is σ = 40734162. Its totient is φ = 10345152.

The previous prime is 20690333. The next prime is 20690339. The reversal of 20690336 is 63309602.

It is an interprime number because it is at equal distance from previous prime (20690333) and next prime (20690339).

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 9265936 = 3380^2 + 3044^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20690299 and 20690308.

It is not an unprimeable number, because it can be changed into a prime (20690333) 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 as a sum of consecutive naturals, namely, 323255 + ... + 323318.

Almost surely, 2^20690336 is an apocalyptic number.

It is an amenable number.

20690336 is a deficient number, since it is larger than the sum of its proper divisors (20043826).

20690336 is an equidigital number, since it uses as much as digits as its factorization.

20690336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646583 (or 646575 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 20690336 is about 4548.6631002966. The cubic root of 20690336 is about 274.5296024381.

Adding to 20690336 its reverse (63309602), we get a palindrome (83999938).

The spelling of 20690336 in words is "twenty million, six hundred ninety thousand, three hundred thirty-six".