1020666 has 8 divisors (see below), whose sum is σ = 2041344. Its totient is φ = 340220.

The previous prime is 1020631. The next prime is 1020667. The reversal of 1020666 is 6660201.

It is a sphenic number, since it is the product of 3 distinct primes.

1020666 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1020667) 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 3 ways as a sum of consecutive naturals, for example, 85050 + ... + 85061.

It is an arithmetic number, because the mean of its divisors is an integer number (255168).

2^1020666 is an apocalyptic number.

1020666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1020666 is a wasteful number, since it uses less digits than its factorization.

1020666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170116.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1020666 is about 1010.2801591638. The cubic root of 1020666 is about 100.6841750366.

Adding to 1020666 its reverse (6660201), we get a palindrome (7680867).

The spelling of 1020666 in words is "one million, twenty thousand, six hundred sixty-six".