20355530 has 32 divisors (see below), whose sum is σ = 40739328. Its totient is φ = 7272000.

The previous prime is 20355523. The next prime is 20355541. The reversal of 20355530 is 3555302.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20355496 and 20355505.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1505 + ... + 6555.

It is an arithmetic number, because the mean of its divisors is an integer number (1273104).

Almost surely, 2^20355530 is an apocalyptic number.

20355530 is an abundant number, since it is smaller than the sum of its proper divisors (20383798).

20355530 is a wasteful number, since it uses less digits than its factorization.

20355530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102.

The product of its (nonzero) digits is 2250, while the sum is 23.

The square root of 20355530 is about 4511.7103187151. The cubic root of 20355530 is about 273.0407521000.

The spelling of 20355530 in words is "twenty million, three hundred fifty-five thousand, five hundred thirty".