20964320 has 48 divisors (see below), whose sum is σ = 53343360. Its totient is φ = 7739904.

The previous prime is 20964287. The next prime is 20964331. The reversal of 20964320 is 2346902.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 20964320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2960 + ... + 7119.

It is an arithmetic number, because the mean of its divisors is an integer number (1111320).

Almost surely, 2^20964320 is an apocalyptic number.

20964320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20964320 is an abundant number, since it is smaller than the sum of its proper divisors (32379040).

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

20964320 is a wasteful number, since it uses less digits than its factorization.

20964320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10107 (or 10099 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20964320 is about 4578.6810327866. The cubic root of 20964320 is about 275.7360776098.

The spelling of 20964320 in words is "twenty million, nine hundred sixty-four thousand, three hundred twenty".