20690235 has 24 divisors (see below), whose sum is σ = 37193520. Its totient is φ = 11034144.

The previous prime is 20690231. The next prime is 20690251. The reversal of 20690235 is 53209602.

It is not a de Polignac number, because 20690235 - 2² = 20690231 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20690199 and 20690208.

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 23 ways as a sum of consecutive naturals, for example, 7300 + ... + 9729.

It is an arithmetic number, because the mean of its divisors is an integer number (1549730).

Almost surely, 2^20690235 is an apocalyptic number.

20690235 is a deficient number, since it is larger than the sum of its proper divisors (16503285).

20690235 is an equidigital number, since it uses as much as digits as its factorization.

20690235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17049 (or 17037 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20690235 is about 4548.6519981199. The cubic root of 20690235 is about 274.5291557314.

Adding to 20690235 its reverse (53209602), we get a palindrome (73899837).

The spelling of 20690235 in words is "twenty million, six hundred ninety thousand, two hundred thirty-five".