22001994 has 48 divisors (see below), whose sum is σ = 55823040. Its totient is φ = 6131520.

The previous prime is 22001989. The next prime is 22001999. The reversal of 22001994 is 49910022.

It is an interprime number because it is at equal distance from previous prime (22001989) and next prime (22001999).

It is not an unprimeable number, because it can be changed into a prime (22001999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3037 + ... + 7295.

It is an arithmetic number, because the mean of its divisors is an integer number (1162980).

Almost surely, 2^22001994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22001994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27911520).

22001994 is an abundant number, since it is smaller than the sum of its proper divisors (33821046).

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

22001994 is a wasteful number, since it uses less digits than its factorization.

22001994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4315 (or 4312 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 22001994 is about 4690.6283161214. The cubic root of 22001994 is about 280.2123983650.

The spelling of 22001994 in words is "twenty-two million, one thousand, nine hundred ninety-four".