20690225 has 12 divisors (see below), whose sum is σ = 26772096. Its totient is φ = 15832080.

The previous prime is 20690213. The next prime is 20690227. The reversal of 20690225 is 52209602.

It is not a de Polignac number, because 20690225 - 2⁴ = 20690209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20690194 and 20690203.

It is not an unprimeable number, because it can be changed into a prime (20690227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17417 + ... + 18566.

It is an arithmetic number, because the mean of its divisors is an integer number (2231008).

Almost surely, 2^20690225 is an apocalyptic number.

20690225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20690225 is a deficient number, since it is larger than the sum of its proper divisors (6081871).

20690225 is a wasteful number, since it uses less digits than its factorization.

20690225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36016 (or 36011 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20690225 is about 4548.6508988930. The cubic root of 20690225 is about 274.5291115030.

Adding to 20690225 its reverse (52209602), we get a palindrome (72899827).

The spelling of 20690225 in words is "twenty million, six hundred ninety thousand, two hundred twenty-five".