20690230 has 32 divisors (see below), whose sum is σ = 40849920. Its totient is φ = 7482720.

The previous prime is 20690227. The next prime is 20690231. The reversal of 20690230 is 3209602.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20690231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25897 + ... + 26683.

It is an arithmetic number, because the mean of its divisors is an integer number (1276560).

Almost surely, 2^20690230 is an apocalyptic number.

20690230 is a deficient number, since it is larger than the sum of its proper divisors (20159690).

20690230 is a wasteful number, since it uses less digits than its factorization.

20690230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20690230 is about 4548.6514485065. The cubic root of 20690230 is about 274.5291336172.

Adding to 20690230 its reverse (3209602), we get a palindrome (23899832).

The spelling of 20690230 in words is "twenty million, six hundred ninety thousand, two hundred thirty".