22271220 has 48 divisors (see below), whose sum is σ = 69289920. Its totient is φ = 5938848.

The previous prime is 22271219. The next prime is 22271231. The reversal of 22271220 is 2217222.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 22271193 and 22271202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20082 + ... + 21161.

It is an arithmetic number, because the mean of its divisors is an integer number (1443540).

Almost surely, 2^22271220 is an apocalyptic number.

22271220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22271220 is an abundant number, since it is smaller than the sum of its proper divisors (47018700).

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

22271220 is a wasteful number, since it uses less digits than its factorization.

22271220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41261 (or 41253 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 22271220 is about 4719.2393454878. The cubic root of 22271220 is about 281.3507017172.

Adding to 22271220 its reverse (2217222), we get a palindrome (24488442).

The spelling of 22271220 in words is "twenty-two million, two hundred seventy-one thousand, two hundred twenty".