22066660 has 144 divisors (see below), whose sum is σ = 62052480. Its totient is φ = 6504960.

The previous prime is 22066643. The next prime is 22066661. The reversal of 22066660 is 6666022.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (22066661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 247896 + ... + 247984.

It is an arithmetic number, because the mean of its divisors is an integer number (430920).

Almost surely, 2^22066660 is an apocalyptic number.

22066660 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 22066660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31026240).

22066660 is an abundant number, since it is smaller than the sum of its proper divisors (39985820).

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

22066660 is a wasteful number, since it uses less digits than its factorization.

22066660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 22066660 is about 4697.5163650593. The cubic root of 22066660 is about 280.4866536821.

The spelling of 22066660 in words is "twenty-two million, sixty-six thousand, six hundred sixty".