20352220 has 48 divisors (see below), whose sum is σ = 50178240. Its totient is φ = 6787584.

The previous prime is 20352203. The next prime is 20352259. The reversal of 20352220 is 2225302.

It is a junction number, because it is equal to n+sod(n) for n = 20352194 and 20352203.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3216 + ... + 7144.

It is an arithmetic number, because the mean of its divisors is an integer number (1045380).

Almost surely, 2^20352220 is an apocalyptic number.

20352220 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 20352220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25089120).

20352220 is an abundant number, since it is smaller than the sum of its proper divisors (29826020).

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

20352220 is a wasteful number, since it uses less digits than its factorization.

20352220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982 (or 3980 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 20352220 is about 4511.3434806053. The cubic root of 20352220 is about 273.0259516358.

Adding to 20352220 its reverse (2225302), we get a palindrome (22577522).

The spelling of 20352220 in words is "twenty million, three hundred fifty-two thousand, two hundred twenty".