22655220 has 192 divisors, whose sum is σ = 81285120. Its totient is φ = 4589568.

The previous prime is 22655219. The next prime is 22655249. The reversal of 22655220 is 2255622.

It is a super-4 number, since 4×22655220⁴ (a number of 31 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 135577 + ... + 135743.

It is an arithmetic number, because the mean of its divisors is an integer number (423360).

Almost surely, 2^22655220 is an apocalyptic number.

22655220 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 22655220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40642560).

22655220 is an abundant number, since it is smaller than the sum of its proper divisors (58629900).

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

22655220 is a wasteful number, since it uses less digits than its factorization.

22655220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 22655220 is about 4759.7499934345. The cubic root of 22655220 is about 282.9585109010.

The spelling of 22655220 in words is "twenty-two million, six hundred fifty-five thousand, two hundred twenty".