20352222 has 80 divisors (see below), whose sum is σ = 51017472. Its totient is φ = 6036120.

The previous prime is 20352203. The next prime is 20352259. The reversal of 20352222 is 22225302.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20352195 and 20352204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 433003 + ... + 433049.

Almost surely, 2^20352222 is an apocalyptic number.

20352222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20352222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25508736).

20352222 is an abundant number, since it is smaller than the sum of its proper divisors (30665250).

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

20352222 is an frugal number, since it uses more digits than its factorization.

20352222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20352222 is about 4511.3437022688. The cubic root of 20352222 is about 273.0259605792.

Adding to 20352222 its reverse (22225302), we get a palindrome (42577524).

Subtracting 20352222 from its reverse (22225302), we obtain a triangular number (1873080 = T₁₉₃₅).

It can be divided in two parts, 203 and 52222, that added together give a palindrome (52425).

The spelling of 20352222 in words is "twenty million, three hundred fifty-two thousand, two hundred twenty-two".