2066686820 has 48 divisors (see below), whose sum is σ = 4835351808. Its totient is φ = 735528960.

The previous prime is 2066686819. The next prime is 2066686849. The reversal of 2066686820 is 286866602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89597 + ... + 110276.

It is an arithmetic number, because the mean of its divisors is an integer number (100736496).

Almost surely, 2^2066686820 is an apocalyptic number.

2066686820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2066686820 is an abundant number, since it is smaller than the sum of its proper divisors (2768664988).

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

2066686820 is a wasteful number, since it uses less digits than its factorization.

2066686820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199940 (or 199938 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 2066686820 is about 45460.8273131935. The cubic root of 2066686820 is about 1273.7715852709.

It can be divided in two parts, 2066 and 686820, that added together give a palindrome (688886).

The spelling of 2066686820 in words is "two billion, sixty-six million, six hundred eighty-six thousand, eight hundred twenty".