20690996 has 6 divisors (see below), whose sum is σ = 36209250. Its totient is φ = 10345496.

The previous prime is 20690993. The next prime is 20691001. The reversal of 20690996 is 69909602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17522596 + 3168400 = 4186^2 + 1780^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20690993) 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, 2586371 + ... + 2586378.

It is an arithmetic number, because the mean of its divisors is an integer number (6034875).

Almost surely, 2^20690996 is an apocalyptic number.

It is an amenable number.

20690996 is a deficient number, since it is larger than the sum of its proper divisors (15518254).

20690996 is a wasteful number, since it uses less digits than its factorization.

20690996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5172753 (or 5172751 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 20690996 is about 4548.7356485072. The cubic root of 20690996 is about 274.5325214758.

The spelling of 20690996 in words is "twenty million, six hundred ninety thousand, nine hundred ninety-six".