20324220 has 144 divisors (see below), whose sum is σ = 68640768. Its totient is φ = 4475520.

The previous prime is 20324207. The next prime is 20324221. The reversal of 20324220 is 2242302.

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 20324220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20324221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91029 + ... + 91251.

It is an arithmetic number, because the mean of its divisors is an integer number (476672).

Almost surely, 2^20324220 is an apocalyptic number.

20324220 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 20324220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34320384).

20324220 is an abundant number, since it is smaller than the sum of its proper divisors (48316548).

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

20324220 is a wasteful number, since it uses less digits than its factorization.

20324220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 271 counting only the distinct ones).

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

The square root of 20324220 is about 4508.2391240927. The cubic root of 20324220 is about 272.9006870844.

Adding to 20324220 its reverse (2242302), we get a palindrome (22566522).

The spelling of 20324220 in words is "twenty million, three hundred twenty-four thousand, two hundred twenty".