21920326 has 4 divisors (see below), whose sum is σ = 32880492. Its totient is φ = 10960162.

The previous prime is 21920321. The next prime is 21920359. The reversal of 21920326 is 62302912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21920326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21920321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5480080 + ... + 5480083.

It is an arithmetic number, because the mean of its divisors is an integer number (8220123).

Almost surely, 2^21920326 is an apocalyptic number.

21920326 is a deficient number, since it is larger than the sum of its proper divisors (10960166).

21920326 is a wasteful number, since it uses less digits than its factorization.

21920326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10960165.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 21920326 is about 4681.9147792330. The cubic root of 21920326 is about 279.8652668108.

The spelling of 21920326 in words is "twenty-one million, nine hundred twenty thousand, three hundred twenty-six".