20683820 has 48 divisors (see below), whose sum is σ = 45550848. Its totient is φ = 7879680.

The previous prime is 20683813. The next prime is 20683823. The reversal of 20683820 is 2838602.

It is not an unprimeable number, because it can be changed into a prime (20683823) 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 in 15 ways as a sum of consecutive naturals, for example, 45032 + ... + 45488.

It is an arithmetic number, because the mean of its divisors is an integer number (948976).

Almost surely, 2^20683820 is an apocalyptic number.

20683820 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 20683820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22775424).

20683820 is an abundant number, since it is smaller than the sum of its proper divisors (24867028).

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

20683820 is a wasteful number, since it uses less digits than its factorization.

20683820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20683820 is about 4547.9467894864. The cubic root of 20683820 is about 274.5007802429.

The spelling of 20683820 in words is "twenty million, six hundred eighty-three thousand, eight hundred twenty".