22009988 has 96 divisors (see below), whose sum is σ = 54190080. Its totient is φ = 7539840.

The previous prime is 22009973. The next prime is 22009991. The reversal of 22009988 is 88990022.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91973 + ... + 92211.

It is an arithmetic number, because the mean of its divisors is an integer number (564480).

Almost surely, 2^22009988 is an apocalyptic number.

22009988 is a gapful number since it is divisible by the number (28) 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 22009988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27095040).

22009988 is an abundant number, since it is smaller than the sum of its proper divisors (32180092).

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

22009988 is a wasteful number, since it uses less digits than its factorization.

22009988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 22009988 is about 4691.4803633821. The cubic root of 22009988 is about 280.2463308452.

The spelling of 22009988 in words is "twenty-two million, nine thousand, nine hundred eighty-eight".