100820660 has 24 divisors (see below), whose sum is σ = 212806440. Its totient is φ = 40121984.

The previous prime is 100820647. The next prime is 100820677. The reversal of 100820660 is 66028001.

It can be written as a sum of positive squares in 4 ways, for example, as 59783824 + 41036836 = 7732^2 + 6406^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8855 + ... + 16734.

It is an arithmetic number, because the mean of its divisors is an integer number (8866935).

Almost surely, 2^100820660 is an apocalyptic number.

100820660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100820660 is an abundant number, since it is smaller than the sum of its proper divisors (111985780).

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

100820660 is a wasteful number, since it uses less digits than its factorization.

100820660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25795 (or 25793 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 100820660 is about 10040.9491583216. The cubic root of 100820660 is about 465.4251478413.

Adding to 100820660 its reverse (66028001), we get a palindrome (166848661).

The spelling of 100820660 in words is "one hundred million, eight hundred twenty thousand, six hundred sixty".