20303220 has 48 divisors (see below), whose sum is σ = 64971648. Its totient is φ = 4640640.

The previous prime is 20303203. The next prime is 20303249. The reversal of 20303220 is 2230302.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20303196 and 20303205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23751 + ... + 24590.

It is an arithmetic number, because the mean of its divisors is an integer number (1353576).

Almost surely, 2^20303220 is an apocalyptic number.

20303220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20303220 is an abundant number, since it is smaller than the sum of its proper divisors (44668428).

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

20303220 is a wasteful number, since it uses less digits than its factorization.

20303220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48360 (or 48358 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 12.

The square root of 20303220 is about 4505.9094531515. The cubic root of 20303220 is about 272.8066631500.

Adding to 20303220 its reverse (2230302), we get a palindrome (22533522).

The spelling of 20303220 in words is "twenty million, three hundred three thousand, two hundred twenty".