22220000 has 120 divisors (see below), whose sum is σ = 60224472. Its totient is φ = 8000000.

The previous prime is 22219999. The next prime is 22220027. The reversal of 22220000 is 2222.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 22220000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 219950 + ... + 220050.

Almost surely, 2^22220000 is an apocalyptic number.

22220000 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 22220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30112236).

22220000 is an abundant number, since it is smaller than the sum of its proper divisors (38004472).

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

22220000 is a wasteful number, since it uses less digits than its factorization.

22220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 22220000 is about 4713.8094997571. The cubic root of 22220000 is about 281.1348499808.

Adding to 22220000 its reverse (2222), we get a palindrome (22222222).

Multiplying 22220000 by its reverse (2222), we get a square (49372840000 = 222200²).

22220000 divided by its reverse (2222) gives a 4-th power (10000 = 10⁴).

It can be divided in two parts, 22 and 220000, that multiplied together give a square (4840000 = 2200²).

The spelling of 22220000 in words is "twenty-two million, two hundred twenty thousand".