22757220 has 192 divisors, whose sum is σ = 78140160. Its totient is φ = 5474304.

The previous prime is 22757213. The next prime is 22757221. The reversal of 22757220 is 2275722.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (22757221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 339627 + ... + 339693.

It is an arithmetic number, because the mean of its divisors is an integer number (406980).

Almost surely, 2^22757220 is an apocalyptic number.

22757220 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 22757220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39070080).

22757220 is an abundant number, since it is smaller than the sum of its proper divisors (55382940).

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

22757220 is a wasteful number, since it uses less digits than its factorization.

22757220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 22757220 is about 4770.4528086965. The cubic root of 22757220 is about 283.3825274058.

The spelling of 22757220 in words is "twenty-two million, seven hundred fifty-seven thousand, two hundred twenty".