20243220 has 48 divisors (see below), whose sum is σ = 59149440. Its totient is φ = 5163136.

The previous prime is 20243219. The next prime is 20243233. The reversal of 20243220 is 2234202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20243220.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 5955 + ... + 8714.

It is an arithmetic number, because the mean of its divisors is an integer number (1232280).

Almost surely, 2^20243220 is an apocalyptic number.

20243220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20243220 is an abundant number, since it is smaller than the sum of its proper divisors (38906220).

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

20243220 is a wasteful number, since it uses less digits than its factorization.

20243220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14704 (or 14702 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 20243220 is about 4499.2466035993. The cubic root of 20243220 is about 272.5376655844.

Adding to 20243220 its reverse (2234202), we get a palindrome (22477422).

The spelling of 20243220 in words is "twenty million, two hundred forty-three thousand, two hundred twenty".