22291220 has 24 divisors (see below), whose sum is σ = 53499264. Its totient is φ = 7642656.

The previous prime is 22291211. The next prime is 22291229. The reversal of 22291220 is 2219222.

It is an interprime number because it is at equal distance from previous prime (22291211) and next prime (22291229).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22291192 and 22291201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22291229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79472 + ... + 79751.

It is an arithmetic number, because the mean of its divisors is an integer number (2229136).

Almost surely, 2^22291220 is an apocalyptic number.

22291220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22291220 is an abundant number, since it is smaller than the sum of its proper divisors (31208044).

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

22291220 is a wasteful number, since it uses less digits than its factorization.

22291220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159239 (or 159237 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 22291220 is about 4721.3578555327. The cubic root of 22291220 is about 281.4348960344.

The spelling of 22291220 in words is "twenty-two million, two hundred ninety-one thousand, two hundred twenty".