20659225 has 24 divisors (see below), whose sum is σ = 26462592. Its totient is φ = 15993600.

The previous prime is 20659201. The next prime is 20659229. The reversal of 20659225 is 52295602.

It is not a de Polignac number, because 20659225 - 2¹⁹ = 20134937 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20659229) 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 in 23 ways as a sum of consecutive naturals, for example, 182769 + ... + 182881.

It is an arithmetic number, because the mean of its divisors is an integer number (1102608).

Almost surely, 2^20659225 is an apocalyptic number.

20659225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20659225 is a deficient number, since it is larger than the sum of its proper divisors (5803367).

20659225 is a wasteful number, since it uses less digits than its factorization.

20659225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 20659225 is about 4545.2420177588. The cubic root of 20659225 is about 274.3919347064.

The spelling of 20659225 in words is "twenty million, six hundred fifty-nine thousand, two hundred twenty-five".