22001868 has 120 divisors (see below), whose sum is σ = 67082400. Its totient is φ = 6158592.

The previous prime is 22001857. The next prime is 22001873. The reversal of 22001868 is 86810022.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 201798 + ... + 201906.

It is an arithmetic number, because the mean of its divisors is an integer number (559020).

Almost surely, 2^22001868 is an apocalyptic number.

22001868 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 22001868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33541200).

22001868 is an abundant number, since it is smaller than the sum of its proper divisors (45080532).

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

22001868 is a wasteful number, since it uses less digits than its factorization.

22001868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 22001868 is about 4690.6148850657. The cubic root of 22001868 is about 280.2118634615.

The spelling of 22001868 in words is "twenty-two million, one thousand, eight hundred sixty-eight".