22981660 has 48 divisors (see below), whose sum is σ = 52397856. Its totient is φ = 8416512.

The previous prime is 22981657. The next prime is 22981663. The reversal of 22981660 is 6618922.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22981657) and next prime (22981663).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22981663) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 40539 + ... + 41101.

It is an arithmetic number, because the mean of its divisors is an integer number (1091622).

Almost surely, 2^22981660 is an apocalyptic number.

22981660 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 22981660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26198928).

22981660 is an abundant number, since it is smaller than the sum of its proper divisors (29416196).

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

22981660 is a wasteful number, since it uses less digits than its factorization.

22981660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 22981660 is about 4793.9190648153. The cubic root of 22981660 is about 284.3110887249.

The spelling of 22981660 in words is "twenty-two million, nine hundred eighty-one thousand, six hundred sixty".