20303280 has 120 divisors (see below), whose sum is σ = 69000048. Its totient is φ = 5349888.

The previous prime is 20303279. The next prime is 20303281. The reversal of 20303280 is 8230302.

It is an interprime number because it is at equal distance from previous prime (20303279) and next prime (20303281).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20303281) 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, 117274 + ... + 117446.

Almost surely, 2^20303280 is an apocalyptic number.

20303280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20303280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34500024).

20303280 is an abundant number, since it is smaller than the sum of its proper divisors (48696768).

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

20303280 is a wasteful number, since it uses less digits than its factorization.

20303280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20303280 is about 4505.9161110700. The cubic root of 20303280 is about 272.8069318821.

Adding to 20303280 its reverse (8230302), we get a palindrome (28533582).

The spelling of 20303280 in words is "twenty million, three hundred three thousand, two hundred eighty".