21806092 has 48 divisors (see below), whose sum is σ = 48206592. Its totient is φ = 8383680.

The previous prime is 21806089. The next prime is 21806111. The reversal of 21806092 is 29060812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21806092.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25138 + ... + 25990.

It is an arithmetic number, because the mean of its divisors is an integer number (1004304).

Almost surely, 2^21806092 is an apocalyptic number.

21806092 is a gapful number since it is divisible by the number (22) 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 21806092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24103296).

21806092 is an abundant number, since it is smaller than the sum of its proper divisors (26400500).

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

21806092 is a wasteful number, since it uses less digits than its factorization.

21806092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958 (or 956 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21806092 is about 4669.6993479238. The cubic root of 21806092 is about 279.3782633201.

The spelling of 21806092 in words is "twenty-one million, eight hundred six thousand, ninety-two".