20943580 has 96 divisors (see below), whose sum is σ = 53222400. Its totient is φ = 6914880.

The previous prime is 20943563. The next prime is 20943599. The reversal of 20943580 is 8534902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294945 + ... + 295015.

It is an arithmetic number, because the mean of its divisors is an integer number (554400).

Almost surely, 2^20943580 is an apocalyptic number.

20943580 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 20943580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26611200).

20943580 is an abundant number, since it is smaller than the sum of its proper divisors (32278820).

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

20943580 is a wasteful number, since it uses less digits than its factorization.

20943580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20943580 is about 4576.4156279779. The cubic root of 20943580 is about 275.6451190487.

The spelling of 20943580 in words is "twenty million, nine hundred forty-three thousand, five hundred eighty".