20355224 has 8 divisors (see below), whose sum is σ = 38166060. Its totient is φ = 10177608.

The previous prime is 20355221. The next prime is 20355241. The reversal of 20355224 is 42255302.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20355224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272194 + ... + 1272209.

Almost surely, 2^20355224 is an apocalyptic number.

It is an amenable number.

20355224 is a deficient number, since it is larger than the sum of its proper divisors (17810836).

20355224 is a wasteful number, since it uses less digits than its factorization.

20355224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544409 (or 2544405 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20355224 is about 4511.6764068359. The cubic root of 20355224 is about 273.0393839069.

The spelling of 20355224 in words is "twenty million, three hundred fifty-five thousand, two hundred twenty-four".