22001818860 has 288 divisors, whose sum is σ = 81785249280. Its totient is φ = 4809898368.

The previous prime is 22001818843. The next prime is 22001818957. The reversal of 22001818860 is 6881810022.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1994119 + ... + 2005121.

It is an arithmetic number, because the mean of its divisors is an integer number (283976560).

Almost surely, 2^22001818860 is an apocalyptic number.

22001818860 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 22001818860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40892624640).

22001818860 is an abundant number, since it is smaller than the sum of its proper divisors (59783430420).

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

22001818860 is a wasteful number, since it uses less digits than its factorization.

22001818860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11074 (or 11043 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The spelling of 22001818860 in words is "twenty-two billion, one million, eight hundred eighteen thousand, eight hundred sixty".