20960820 has 144 divisors (see below), whose sum is σ = 68245632. Its totient is φ = 5195520.

The previous prime is 20960803. The next prime is 20960831. The reversal of 20960820 is 2806902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 252499 + ... + 252581.

It is an arithmetic number, because the mean of its divisors is an integer number (473928).

Almost surely, 2^20960820 is an apocalyptic number.

20960820 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 20960820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34122816).

20960820 is an abundant number, since it is smaller than the sum of its proper divisors (47284812).

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

20960820 is a wasteful number, since it uses less digits than its factorization.

20960820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20960820 is about 4578.2988106938. The cubic root of 20960820 is about 275.7207320134.

It can be divided in two parts, 209608 and 20, that added together give a triangular number (209628 = T₆₄₇).

The spelling of 20960820 in words is "twenty million, nine hundred sixty thousand, eight hundred twenty".