20303320 has 32 divisors (see below), whose sum is σ = 45875520. Its totient is φ = 8087040.

The previous prime is 20303299. The next prime is 20303329. The reversal of 20303320 is 2330302.

It is a self number, because there is not a number n which added to its sum of digits gives 20303320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9904 + ... + 11776.

It is an arithmetic number, because the mean of its divisors is an integer number (1433610).

Almost surely, 2^20303320 is an apocalyptic number.

20303320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20303320 is an abundant number, since it is smaller than the sum of its proper divisors (25572200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20303320 is a wasteful number, since it uses less digits than its factorization.

20303320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155 (or 2151 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 13.

The square root of 20303320 is about 4505.9205496768. The cubic root of 20303320 is about 272.8071110366.

Adding to 20303320 its reverse (2330302), we get a palindrome (22633622).

The spelling of 20303320 in words is "twenty million, three hundred three thousand, three hundred twenty".