21796320 has 192 divisors, whose sum is σ = 84672000. Its totient is φ = 4589568.

The previous prime is 21796319. The next prime is 21796321. The reversal of 21796320 is 2369712.

It is an interprime number because it is at equal distance from previous prime (21796319) and next prime (21796321).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796321) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 43431 + ... + 43929.

It is an arithmetic number, because the mean of its divisors is an integer number (441000).

Almost surely, 2^21796320 is an apocalyptic number.

21796320 is a gapful number since it is divisible by the number (20) 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 21796320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42336000).

21796320 is an abundant number, since it is smaller than the sum of its proper divisors (62875680).

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

21796320 is a wasteful number, since it uses less digits than its factorization.

21796320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 21796320 is about 4668.6529106371. The cubic root of 21796320 is about 279.3365243372.

The spelling of 21796320 in words is "twenty-one million, seven hundred ninety-six thousand, three hundred twenty".