21794544 has 120 divisors (see below), whose sum is σ = 67026960. Its totient is φ = 6580224.

The previous prime is 21794543. The next prime is 21794551. The reversal of 21794544 is 44549712.

It is a happy number.

21794544 is a `hidden beast` number, since 21 + 7 + 94 + 544 = 666.

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

It is a zygodrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 21794499 and 21794508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21794543) 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, 70839 + ... + 71145.

It is an arithmetic number, because the mean of its divisors is an integer number (558558).

Almost surely, 2^21794544 is an apocalyptic number.

21794544 is a gapful number since it is divisible by the number (24) 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 21794544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33513480).

21794544 is an abundant number, since it is smaller than the sum of its proper divisors (45232416).

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

21794544 is a wasteful number, since it uses less digits than its factorization.

21794544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 358 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 21794544 is about 4668.4627020037. The cubic root of 21794544 is about 279.3289371979.

The spelling of 21794544 in words is "twenty-one million, seven hundred ninety-four thousand, five hundred forty-four".