660920 has 64 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 230400.

The previous prime is 660917. The next prime is 660923. The reversal of 660920 is 29066.

It is an interprime number because it is at equal distance from previous prime (660917) and next prime (660923).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660920.

It is not an unprimeable number, because it can be changed into a prime (660923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16100 + ... + 16140.

It is an arithmetic number, because the mean of its divisors is an integer number (26460).

2⁶⁶⁰⁹²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (846720).

660920 is an abundant number, since it is smaller than the sum of its proper divisors (1032520).

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

660920 is a wasteful number, since it uses less digits than its factorization.

660920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 660920 is about 812.9698641401. The cubic root of 660920 is about 87.1063129810.

Adding to 660920 its reverse (29066), we get a palindrome (689986).

The spelling of 660920 in words is "six hundred sixty thousand, nine hundred twenty".